trigram

This is a table of type trigram and their frequencies. Use it to search & browse the list to learn more about your study carrel.

trigram	frequency
a genus of	199
of the shell	193
part of the	125
of microscopic foraminifera	110
genus of microscopic	109
in each valve	99
genus composed of	89
a genus composed	89
of the genus	87
the outer lip	79
of the animal	78
found in the	75
of the aperture	71
of the order	69
said to be	67
are found in	64
the shells of	61
the shell is	59
family of the	56
the body whorl	56
side of the	48
at the base	48
is said to	48
on account of	47
more or less	47
a series of	47
of this genus	47
this genus is	45
the last whorl	44
of species of	43
of the body	43
of which are	42
are described as	42
contains the genera	41
muscular impressions two	40
belonging to the	40
of the same	40
so as to	39
some of the	39
composed of species	38
one of the	37
the inner lip	37
edge of the	37
the shells are	36
in which the	36
in one valve	36
published at l	35
surface of the	34
water to fathoms	33
on the columella	33
in the centre	33
two in each	33
base of the	32
on each side	32
at l s	32
fossil species are	32
of the whorls	31
low water to	31
the base of	30
is found in	30
the name of	30
as in the	30
of the spire	30
in the other	30
this family contains	29
and in the	29
the centre of	29
there is a	29
shells of this	29
account of the	29
family contains the	29
containing the genera	28
which it is	28
the family of	28
on the hinge	28
the following genera	28
the animal is	28
the hinge of	28
species are found	27
this genus are	27
a species of	27
by means of	27
in a fossil	27
a bivalve shell	27
a fossil state	27
of the hinge	26
will be found	26
which may be	26
of the valves	26
of which is	26
a term applied	25
the species are	25
distinguished by the	25
covered with a	25
of the outer	25
shells of the	25
those species of	25
which have the	25
it will be	25
is divided into	25
outer lip thickened	25
divided into the	25
by de blainville	25
parts of the	25
under the name	25
in this family	24
the aperture is	24
of a shell	24
of the shells	24
may be known	24
in the system	24
the surface of	24
the edge of	23
and similar species	23
in the plates	23
margin of the	23
a family of	23
some species of	23
this family are	22
in the hinge	22
a kind of	22
in the genus	22
in the first	22
of the umbones	22
folds on the	21
term applied to	21
which they are	21
the system of	21
a family belonging	21
terminating in a	21
as well as	21
the aperture of	21
two or three	21
family belonging to	21
sides of the	21
outer lip thin	21
impressions two in	21
a number of	21
are said to	21
the first section	21
in some species	21
the back of	21
it may be	21
centre of the	21
described as having	20
of the most	20
species of this	20
is distinguished from	20
and west indies	20
the appearance of	20
of those species	20
this genus of	20
the number of	20
the form of	20
that it is	20
the margin of	19
back of the	19
the fossil species	19
of the class	19
the recent species	19
section of the	19
edges of the	19
composing this genus	19
of the species	19
order of the	19
a genus formed	19
to be found	19
of a bivalve	19
shells composing this	19
applied to the	19
east and west	19
the lower valve	19
the order conchifera	19
to each other	19
at the anterior	19
in the latter	18
the greater part	18
is described as	18
on one side	18
remarkable for the	18
portion of the	18
one or two	18
which are described	18
each side of	18
with a large	18
greater part of	18
teeth in each	18
order conchifera dimyaria	18
the valves of	18
this is the	18
by the last	18
included in the	17
in order to	17
when it is	17
according to the	17
species of the	17
in the british	17
from the umbones	17
of the columella	17
it is said	17
recent species are	17
that of the	17
consisting of few	17
as to form	17
near the centre	17
in general form	17
first section of	17
be found in	17
the valves are	17
the second family	17
distinguished from the	17
there are several	17
the study of	17
the genus helix	17
in the family	17
the apex of	17
by the author	16
each other in	16
belong to the	16
the point of	16
attached by a	16
extremity of the	16
to form a	16
in having the	16
is called the	16
attached to the	16
from which it	16
division of the	16
at the apex	16
the body of	16
known by the	16
second family of	16
body of the	16
a portion of	16
the muscular impression	16
of this family	16
the head of	16
shells belonging to	16
hinge with two	15
shells of which	15
from low water	15
from each other	15
is composed of	15
number of species	15
of four valves	15
those of the	15
and other similar	15
they are all	15
in the tertiary	15
these shells are	15
of the family	15
on the inner	15
the order trachelipoda	15
from the apex	15
attached by the	15
of numerous whorls	15
of the sea	15
sinus in the	15
the first family	15
other similar species	15
in which they	15
to be seen	15
from the indian	15
are divided into	15
of the mantle	15
it is a	15
view of the	15
means of a	15
in the shell	15
with the outer	15
species occur in	15
the purpose of	15
composed of two	15
of the first	14
those which are	14
all the species	14
are to be	14
containing the cartilage	14
of the inner	14
the upper part	14
is to be	14
to have been	14
a pair of	14
the first order	14
the dorsal margin	14
the ligament is	14
genus of helix	14
tooth in each	14
contained in this	14
genus of the	14
composed of a	14
side by side	14
of the last	14
the shells composing	14
this genus from	14
you will find	14
the anterior extremity	14
the sides of	14
the soft parts	14
the generic name	14
the inner surface	14
of which the	14
the lower part	14
fossil species occur	13
of few whorls	13
from which the	13
such as the	13
many of the	13
cardinal teeth in	13
of one valve	13
to the family	13
the characters of	13
teeth on the	13
consisting of numerous	13
the edges of	13
lip spread over	13
to the first	13
at the sides	13
by some authors	13
is known from	13
terminating anteriorly in	13
the indian ocean	13
hinge with a	13
which have a	13
genus of shells	13
to which the	13
there is no	13
the cardinal teeth	13
the passage of	13
the british museum	13
the spire is	13
it is the	13
its name from	13
the posterior side	13
most of the	13
containing the following	13
known in a	13
is the only	13
genus of small	13
be known from	13
consisting of a	13
inner lip spread	13
divided into two	12
it is found	12
an example of	12
the ventral margin	12
a part of	12
as having the	12
the palleal impression	12
into the families	12
genus is known	12
for the purpose	12
the whorls of	12
the whorls are	12
of each valve	12
the other valve	12
several fossil species	12
at both extremities	12
of the other	12
separated from the	12
commonly called the	12
the species of	12
belongs to the	12
is a very	12
in which it	12
anteriorly in a	12
the power of	12
the genera are	12
of the latter	12
first family of	12
a piece of	12
at the top	12
part of a	12
shell is said	12
found on the	12
a genus described	12
may be thus	12
consisting of species	12
on which the	12
genera of shells	12
in london clay	12
on the posterior	12
in the same	12
to which it	11
two cardinal teeth	11
the second section	11
two muscular impressions	11
structure of the	11
head of the	11
apex of the	11
placed in a	11
to the genus	11
the reception of	11
in the next	11
a generic name	11
the posterior extremity	11
that part of	11
shaped like a	11
produced into a	11
the external surface	11
species of which	11
belonging to this	11
for the reception	11
hinge of the	11
notch in the	11
they are found	11
seen in the	11
the two valves	11
only known in	11
a great number	11
separated by a	11
length of the	11
close to the	11
with a short	11
upper part of	11
a large sinus	11
the shell of	11
of a spiral	11
spread over a	11
corresponding with the	11
great number of	11
in the lower	11
composed of the	11
the third family	11
composed of those	11
towards the anterior	11
the columellar lip	11
it has been	11
derives its name	11
the foot of	11
used to express	11
appearance of a	11
as it were	11
of all the	11
the same as	11
the greater number	10
genus differs from	10
a shell is	10
to the apex	10
is a pretty	10
of a series	10
and in some	10
be thus distinguished	10
genus is distinguished	10
of a byssus	10
in the last	10
the conchological illustrations	10
described as differing	10
in the second	10
a short canal	10
in some instances	10
to the shell	10
lower part of	10
is one of	10
it is called	10
lines of growth	10
cardinal tooth in	10
the latter is	10
the inner edge	10
genus consisting of	10
are composed of	10
in the palleal	10
the anterior of	10
at both ends	10
three or four	10
modified by the	10
in the aperture	10
a genus consisting	10
on the other	10
anterior of the	10
have been found	10
be known by	10
this genus differs	10
the genus is	10
consisting of those	10
the last of	10
name given to	10
term is applied	10
a very large	10
over the back	10
and outer lips	10
in the outer	10
lateral teeth in	10
oval or oblong	10
they are said	10
they have been	10
first order of	10
of de blainville	10
the genera of	10
pit in the	10
end of the	10
second section of	10
the animal has	10
as it is	10
at the extremities	10
form of a	10
be seen in	10
formed for the	10
which it differs	10
as they are	10
the isle of	10
in the mediterranean	10
covered with an	10
tooth on the	10
with a small	10
few fossil species	10
from the true	10
the shells belonging	10
to the present	10
third family of	10
of land shells	10
notch at the	10
the case with	10
divided into three	9
the exception of	9
that there is	9
direction of the	9
at the posterior	9
for the passage	9
will be necessary	9
they are not	9
with the exception	9
with the genus	9
the whole length	9
it differs in	9
of a single	9
when the valves	9
the direction of	9
they may be	9
the inner and	9
a division of	9
in the sand	9
resemblance to the	9
they are divided	9
in the middle	9
it would be	9
palleal impression with	9
the shell itself	9
the seas of	9
but in the	9
it contains the	9
of the two	9
in the sea	9
on the surface	9
when the animal	9
that they are	9
genus formed for	9
a very short	9
one in each	9
and by the	9
by which it	9
this family is	9
the shores of	9
characters of the	9
one of which	9
or nearly so	9
is of a	9
l s d	9
the shell in	9
from to fathoms	9
are those which	9
de blainville in	9
aperture of the	9
are distinguished by	9
over part of	9
the animal of	9
a genus proposed	9
of them are	9
with a triangular	9
to be the	9
fold on the	9
the operculum is	9
of the axis	9
name of the	9
on the back	9
of the science	9
as distinguished from	9
are remarkable for	9
is remarkable for	9
near the umbones	9
inner and outer	9
last of which	9
placed by de	9
brought from the	9
on the upper	9
in some degree	9
passage of a	9
of some shells	9
appears to be	9
on the right	9
by which the	9
to be a	9
the second order	9
species are known	9
to the axis	9
at the lower	9
is the case	9
teeth in the	9
impression with a	9
with two cardinal	9
contained in a	9
that on the	8
with any other	8
of the larger	8
one side of	8
allied to the	8
spread over the	8
and the shell	8
impression of the	8
of the lower	8
this is a	8
but having a	8
of the animals	8
described as resembling	8
various parts of	8
that you have	8
consisting of the	8
those who have	8
a term used	8
formed by the	8
are brought from	8
with regard to	8
several species of	8
of the conchological	8
size of the	8
contains the following	8
some of them	8
and other species	8
feet in length	8
second order of	8
of the pillar	8
covered by the	8
genus are found	8
hinge with three	8
in the case	8
contiguous to the	8
of these are	8
also in the	8
been found in	8
owing to the	8
and from the	8
into the following	8
variable in form	8
species which have	8
genus separated from	8
only one species	8
furnished with a	8
muscular impressions one	8
in a straight	8
genus formed of	8
is distinguished by	8
the third order	8
is a genus	8
is difficult to	8
this term is	8
one hundred and	8
it is necessary	8
of which it	8
as differing from	8
to express the	8
species found in	8
is a common	8
the substance of	8
to the rocks	8
the side of	8
suture of the	8
described as a	8
from which they	8
of the genera	8
the nature of	8
of some authors	8
name from the	8
has been divided	8
temperate and tropical	8
destitute of teeth	8
distance from the	8
over a portion	8
found in a	8
the spire of	8
when there is	8
extra cloth bds	8
gaping at both	8
rest of the	8
valves of a	8
in the form	8
pointed at the	8
which have been	8
system of lamarck	8
may be distinguished	8
the end of	8
genus has been	8
is common in	8
the first is	8
the type of	8
which is not	8
principally in the	8
foot of the	8
placed on the	8
it is difficult	8
be observed that	8
as an example	8
at one end	8
the left valve	8
of the muscular	8
are known from	8
outer lip with	8
position of the	8
belongs to this	8
of the valve	8
the top of	8
the whole of	8
in the opposite	8
the latter genus	8
at the extremity	8
it is not	8
passing through a	8
to this genus	8
the rest of	8
in all climates	8
composed of several	8
some bivalve shells	8
which are found	8
with an epidermis	8
is that part	8
differ from the	8
at each extremity	8
our own coasts	8
greater number of	8
a spiral shell	8
shells which are	8
each other by	8
two lateral teeth	8
it is sometimes	8
those species which	8
composed of numerous	8
of this age	8
interior of the	8
to this family	8
of shelly matter	8
outer lip slightly	8
as far as	8
the remains of	8
be necessary to	8
radiating from the	8
is the most	8
are attached to	8
genus described as	8
of the british	8
is on the	8
of the work	7
differs in the	7
used as a	7
they will be	7
in fresh water	7
a genus separated	7
are mostly tropical	7
fold in the	7
one of them	7
out of the	7
the bottom of	7
in a very	7
covered by a	7
the order lamellibranchiata	7
the term is	7
impressions in each	7
hinge with one	7
carbonate of lime	7
found on our	7
account of their	7
of paracephalophora monoica	7
represented in the	7
this genus has	7
valve of the	7
of the more	7
in some cases	7
three cardinal teeth	7
with the apex	7
not only in	7
the growth of	7
to the other	7
of those who	7
inner lip thickened	7
only in the	7
no lateral teeth	7
on which they	7
in this genus	7
of british shells	7
aperture of a	7
the outer surface	7
being attached by	7
from the east	7
the posterior margin	7
has been separated	7
is named the	7
the columella is	7
apex or nucleus	7
then said to	7
at the back	7
the want of	7
regard to the	7
one on each	7
in others it	7
form of the	7
open at both	7
there is but	7
instead of being	7
appearance of the	7
truncated at the	7
the anterior margin	7
the london clay	7
the east and	7
to which they	7
beds of this	7
is necessary to	7
is found on	7
shells in the	7
occur in the	7
one species of	7
the order gasteropoda	7
hinge without teeth	7
whole of the	7
whole length of	7
in both valves	7
brought to this	7
it is described	7
is but one	7
the mouth of	7
distinguish this genus	7
contained in the	7
the following families	7
are several fossil	7
with a series	7
which in the	7
impressions one in	7
supported on a	7
place in the	7
of this order	7
the size of	7
in having a	7
one or more	7
is that which	7
top of the	7
the animals of	7
been divided into	7
burrowing in sand	7
which is found	7
be distinguished from	7
the right valve	7
the same species	7
in such a	7
the case of	7
species are very	7
an external ligament	7
of the tube	7
valves of which	7
consist of a	7
the east indies	7
the hinge is	7
on our own	7
differs in having	7
fourth family of	7
near the apex	7
character of the	7
in other respects	7
manner in which	7
in a circle	7
for the cabinet	7
section of paracephalophora	7
published by the	7
by the letter	7
which will be	7
having the spire	7
and the aperture	7
a resemblance to	7
by an operculum	7
the absence of	7
the common oyster	7
is in the	7
by de montfort	7
a common name	7
included in this	7
great russell street	7
of the second	7
to the order	7
which the animal	7
teeth in one	7
with a very	7
which are not	7
the first genus	7
with the aperture	7
species of ammonites	7
are not numerous	7
a new genus	7
as to the	7
inner surface of	7
described by de	7
properly so called	7
third order of	7
near the margin	7
such a manner	7
on the anterior	7
at the dorsal	7
that part which	7
upon each other	7
the roots of	7
the fourth family	7
of several species	7
a sort of	7
nature of the	7
the tertiary beds	7
the colour is	7
the interior of	7
and it is	7
be described as	7
of small shells	7
to this country	7
than the other	7
may be seen	7
very variable in	7
to the aperture	7
we find the	7
account of its	7
is a large	7
the thickness of	7
those which have	7
it comes from	7
placed near the	7
a genus founded	7
arranged in a	7
consisting of four	7
by a small	7
at a distance	7
may be added	7
with the plates	7
on the sea	7
system of de	7
which are attached	7
teeth on each	6
nearest to the	6
in some of	6
distinguished as follows	6
in the animal	6
is contained in	6
rapidly increasing whorls	6
appear to be	6
into each other	6
in a groove	6
a horny operculum	6
at the umbones	6
proposed to include	6
is the same	6
to shells of	6
found in london	6
in a short	6
beautifully coloured plates	6
tooth in one	6
union with the	6
to the surface	6
side in a	6
growth of the	6
is only known	6
as soon as	6
to which may	6
the parietal valves	6
two rows of	6
with the hammer	6
species of chiton	6
a distance from	6
under the generic	6
in the former	6
this well known	6
species which are	6
there are many	6
the larger valve	6
in a great	6
which have no	6
the body is	6
placed in the	6
there is one	6
in a point	6
well known to	6
given in the	6
outer lip of	6
genus proposed to	6
small species are	6
by a byssus	6
shell from the	6
the genus trochus	6
the difference between	6
on the outer	6
a young state	6
a single piece	6
the action of	6
plaits on the	6
the figures of	6
species of helix	6
example of this	6
of the beds	6
state of the	6
the genus unio	6
natural history of	6
spire very short	6
genera contained in	6
more properly to	6
the place where	6
closed at the	6
a prominent fulcrum	6
in the skin	6
there are three	6
the anterior side	6
bottom of the	6
at each end	6
the animal to	6
on each valve	6
new south wales	6
isle of wight	6
the anterior termination	6
in general appearance	6
from the body	6
on the opposite	6
introduction to the	6
anterior and posterior	6
the successive layers	6
the habits of	6
coast of africa	6
history of the	6
of bivalve shells	6
great variety of	6
the anterior canal	6
of two or	6
against each other	6
the structure of	6
on the pillar	6
species of ampullaria	6
in a young	6
on rocks and	6
genera may be	6
and descriptions of	6
have an operculum	6
is applied to	6
of a more	6
should be placed	6
of figures to	6
tooth in the	6
which in some	6
land and fresh	6
of shells is	6
in the shells	6
as long as	6
by side in	6
which has the	6
of the sub	6
this country by	6
is a fine	6
in the southern	6
species is known	6
in other cases	6
the spire and	6
for the most	6
of a species	6
anterior part of	6
it is always	6
long as the	6
termination of the	6
country by mr	6
the anterior part	6
it is known	6
muscular impression of	6
the above description	6
of one or	6
front of the	6
in the number	6
only in a	6
on both sides	6
type of this	6
while that of	6
of the spiral	6
and tropical climates	6
of species is	6
one species is	6
united by a	6
in the greater	6
they do not	6
of the next	6
in the upper	6
the apex or	6
one in the	6
the next family	6
the bones of	6
one on the	6
the posterior part	6
of the water	6
with the spire	6
the plants of	6
want of a	6
of the lamarckian	6
on the shores	6
being composed of	6
to the study	6
of this class	6
byssus passing through	6
the genus dentalium	6
genus of land	6
many species of	6
posterior part of	6
are covered with	6
it is very	6
towards the spire	6
which is a	6
genera and species	6
may be observed	6
some of which	6
of fossil shells	6
outer lip simple	6
posterior muscular impression	6
only a few	6
two of which	6
latter of which	6
of these shells	6
the most part	6
placed at the	6
to that of	6
following genera of	6
mouth of the	6
are found on	6
are very numerous	6
it is nearly	6
the shape of	6
common in collections	6
the muscular impressions	6
of a large	6
from the genus	6
in the south	6
and have a	6
as to be	6
occurring in the	6
of the operculum	6
applied to a	6
of the following	6
is a beautiful	6
they belong to	6
substance of the	6
longer than the	6
of an univalve	6
will be seen	6
there are two	6
are several species	6
the manner in	6
histoire naturelle des	6
a fossil genus	6
with a long	6
where it is	6
but differs in	6
shell is composed	6
the red sea	6
containing the genus	6
forbes and hanley	6
series of small	6
in the ventral	6
of the plants	6
in this country	6
all the shells	6
outer lip is	6
figures and descriptions	6
are distinguished from	6
supported upon a	6
is marked with	6
which this genus	6
habits of the	6
passing through the	6
l s this	6
point of the	6
study of the	6
of the world	6
and having a	6
the position of	6
one muscular impression	6
has the power	6
are attached by	6
a straight line	6
the dorsal edge	6
name is derived	6
hiatus in the	6
at the edge	6
comes from the	6
soft parts of	6
that which is	6
a more or	6
to describe the	6
and two lateral	6
coat of mail	6
with the umbo	6
in various parts	6
of great britain	6
the animals are	6
in the left	6
over the body	6
the former is	6
is attached to	5
recent species of	5
of the upper	5
by a flat	5
the author has	5
known from all	5
a native of	5
it is impossible	5
ponds and ditches	5
is impossible to	5
i do not	5
under the microscope	5
by the thickness	5
from the lias	5
so that the	5
last whorl large	5
shells contained in	5
the hinge lamina	5
to those species	5
with a hollow	5
some species are	5
would be more	5
the latter being	5
with the ligament	5
the class mollusca	5
through a hole	5
the shell by	5
with the whorls	5
the whole shell	5
lip with a	5
others it is	5
of the foot	5
although it is	5
the notch in	5
the genus chiton	5
near the posterior	5
hinge of one	5
and to the	5
it is then	5
into chambers by	5
an operculum of	5
london clay and	5
the plates beautifully	5
from the nucleus	5
the name given	5
use of the	5
divided into chambers	5
applied to shells	5
of some bivalve	5
is an example	5
known to be	5
perforated by a	5
the next genus	5
and inhabits stone	5
the most beautiful	5
the principal part	5
with numerous whorls	5
to be observed	5
a short spire	5
which is the	5
this order is	5
of this is	5
and the inner	5
to the species	5
close the aperture	5
answers to the	5
a univalve shell	5
which the whorls	5
to explain the	5
by which they	5
is very large	5
only two or	5
inner lip smooth	5
on the dorsal	5
genus of fossil	5
no genera of	5
figures of the	5
the only genus	5
genera have been	5
remote lateral teeth	5
the opercular valves	5
the whorls being	5
the latter of	5
open at the	5
described as being	5
of the whorl	5
four valves in	5
species are not	5
of tropical climates	5
instance of this	5
of the umbo	5
than the rest	5
the philippine islands	5
which there are	5
to tropical climates	5
is easily known	5
destitute of the	5
resemblance to a	5
the front of	5
the ventral margins	5
the genera may	5
common name given	5
this order are	5
the bivalve shells	5
the extremity of	5
of natural history	5
includes the genera	5
well known genus	5
is formed by	5
is used to	5
is also a	5
where the head	5
the adductor muscles	5
also found in	5
outer surface of	5
are provided with	5
nearly allied to	5
a great variety	5
canal at the	5
which have an	5
with a prominent	5
a large genus	5
both sides of	5
at the bottom	5
full natural size	5
name given by	5
this order contains	5
you may find	5
the shell and	5
species are numerous	5
it must be	5
have not the	5
those in the	5
from the outer	5
a minute fossil	5
at one extremity	5
rows of varices	5
fossil species of	5
an univalve shell	5
lateral tooth in	5
rounded at the	5
with a number	5
characterized by a	5
it consists of	5
point at the	5
forms part of	5
outer lip reflected	5
to any shell	5
general form of	5
bivalve shell is	5
applied to any	5
by the whole	5
a collection of	5
to the outer	5
with an internal	5
of polythalamous cephalopoda	5
on this account	5
a triangular disc	5
it is to	5
of which there	5
on the same	5
in great britain	5
in the right	5
named from the	5
posteriorly in a	5
which are placed	5
the upper valve	5
apex to the	5
a fossil species	5
tooth of the	5
from all other	5
found in rivers	5
having an operculum	5
many of them	5
the volutions of	5
may also be	5
of the pacific	5
easily distinguished from	5
so named from	5
found near the	5
are destitute of	5
principal part of	5
a sinus in	5
is easily distinguished	5
the lines of	5
gaping at the	5
which has a	5
case with the	5
and form a	5
this may be	5
is furnished with	5
outside of the	5
number of genera	5
explanation of figures	5
by the waves	5
the first instance	5
are common in	5
to the canal	5
the shells in	5
genera enumerated in	5
their shells are	5
them from the	5
lip slightly thickened	5
is also applied	5
of new holland	5
placed among the	5
to the brachiopoda	5
of a univalve	5
to the spire	5
ligamentary pit in	5
hinder part of	5
family of polythalamous	5
shells are found	5
of some of	5
consists in the	5
destitute of shells	5
nearest approach to	5
a pretty shell	5
is also used	5
no danger of	5
they differ from	5
and the posterior	5
sometimes called the	5
the contents of	5
a byssus passing	5
a regular spire	5
with a thick	5
are represented in	5
common name for	5
buried in the	5
the internal ligament	5
with a single	5
in many instances	5
occurs in the	5
in the chalk	5
umbones separated by	5
is that the	5
by one or	5
external surface of	5
hidden by the	5
a notch or	5
is a small	5
in every respect	5
in his genus	5
of which only	5
the apex to	5
the general form	5
exception of the	5
part which is	5
are furnished with	5
species belong to	5
cardinal and two	5
have been separated	5
of species with	5
the indian seas	5
of de montfort	5
low water mark	5
coasts of the	5
of the isle	5
belong to tropical	5
shape of the	5
in the zoological	5
the most remarkable	5
so that they	5
operculum consisting of	5
the common garden	5
genus of pupa	5
that in the	5
which forms the	5
corresponds with the	5
the septa of	5
anterior muscular impression	5
in some respects	5
indicated by the	5
in the nautilus	5
de blainville as	5
the umbo of	5
example of the	5
by the muscular	5
united by sowerby	5
the well known	5
of the hammer	5
a variety of	5
are beautifully coloured	5
of the columellar	5
muscular impressions are	5
and the upper	5
and some others	5
have but one	5
which you will	5
are examples of	5
be distinguished by	5
fixed on the	5
plates beautifully coloured	5
is termed the	5
that the animal	5
genus of natica	5
species of venus	5
of spiral univalves	5
to the base	5
on the coast	5
in parts to	5
cast of a	5
they are described	5
to marine substances	5
lip thickened within	5
nearly all the	5
will find it	5
the outside of	5
posterior side of	5
that of a	5
from its resemblance	5
between the umbones	5
from any other	5
greatest distance from	5
axis of the	5
two british species	5
muscular impressions in	5
other genera of	5
be confounded with	5
margins of the	5
is one which	5
the greatest distance	5
the length of	5
and there is	5
in this respect	5
valves in pairs	5
or three species	5
the opposite side	5
other in a	5
the suture of	5
but also in	5
a rare and	5
shell when it	5
the time of	5
or those which	5
with or without	5
in many cases	5
in the genera	5
and the anterior	5
oblong or oval	5
at the greatest	5
is a rare	5
from those of	5
the neighbourhood of	5
the generic characters	5
and a very	5
british species of	5
reflected over the	5
are natives of	5
and of the	5
in this order	5
closed at one	5
among the most	5
a few fossil	5
the nearest approach	5
order is divided	5
of them is	5
three or more	5
fossils of the	5
a fossil shell	5
down to the	5
any other genus	5
of the canal	5
on the outside	5
the under side	5
our own shores	5
of both valves	5
from the centre	5
genera into which	5
larger than the	5
in the direction	5
order of paracephalophora	5
to be obtained	5
water to fath	5
and of a	5
to have a	5
class of the	5
near the aperture	5
in not having	4
canal at each	4
of the parent	4
for the first	4
being larger than	4
will give you	4
have the spire	4
or any other	4
supposed to be	4
a mass of	4
from the spire	4
of one of	4
families of the	4
the surfaces of	4
of the various	4
which separates the	4
by a series	4
series of teeth	4
the list of	4
of the septa	4
not having the	4
it is also	4
to the genera	4
is covered with	4
genus from the	4
part of these	4
of the specimen	4
a bivalve is	4
remote from the	4
in the explanation	4
to distinguish this	4
in which case	4
typical species of	4
simple in form	4
are the most	4
given to the	4
form part of	4
of multivalve shells	4
closed by the	4
to the nayades	4
those in which	4
species are british	4
they are also	4
towards the posterior	4
by the name	4
which forms a	4
thinness of the	4
seas of new	4
will be observed	4
umbones in each	4
the mouth is	4
by the inner	4
at the end	4
in this case	4
with a kind	4
genus of sessile	4
the most elegant	4
species have been	4
having but one	4
six parietal valves	4
when full grown	4
a tooth on	4
and some of	4
a triangular area	4
and they are	4
on the edge	4
known only in	4
at low water	4
as to present	4
in a long	4
s this is	4
to the inner	4
of testaceous mollusca	4
they are distinguished	4
in most cases	4
the other side	4
have been formed	4
the regularity of	4
one lateral tooth	4
name of a	4
by the number	4
the animal in	4
a few species	4
genus of melanopsis	4
of its form	4
larger and more	4
the class acephalophora	4
of the author	4
to the margin	4
an hiatus in	4
the use of	4
having the inner	4
will be the	4
from the seas	4
like that of	4
in some parts	4
next in order	4
dorsal margin of	4
a slight emargination	4
found buried in	4
examples of this	4
for this purpose	4
family are described	4
a microscopic shell	4
has the appearance	4
absence of the	4
the shell has	4
consisting of two	4
the lateral teeth	4
which the shells	4
it is turned	4
shell of a	4
rudiments of conchology	4
hole in the	4
as in murex	4
of the indian	4
be observed in	4
two cardinal and	4
the anterior and	4
the axis of	4
equal to the	4
tabular view of	4
when the whorls	4
collection may be	4
muscular impressions distant	4
the latter are	4
opening at the	4
from the south	4
the young of	4
it should be	4
analogous to the	4
relation to the	4
the common snail	4
varix at the	4
remote lateral tooth	4
on all coasts	4
the species hitherto	4
are separated by	4
provided with a	4
the ligamentary pit	4
genus of bulinus	4
the character of	4
difference in the	4
to receive the	4
in the seas	4
pair of forceps	4
number of instances	4
from side to	4
common garden slug	4
like the common	4
and may be	4
the pinna is	4
palleal impression not	4
in the isle	4
seas of the	4
in sand and	4
the plants on	4
you know the	4
it is divided	4
reflected over part	4
and also in	4
isle of france	4
as having a	4
the hinge line	4
extremities of the	4
which has been	4
is no danger	4
in all seas	4
is a fossil	4
from the mediterranean	4
species of terebratula	4
and is divided	4
the columella has	4
skin of the	4
they are very	4
as consisting of	4
and the second	4
to belong to	4
are placed at	4
of sessile cirripedes	4
far as they	4
in a canal	4
and one remote	4
on the contrary	4
is then said	4
in the neighbourhood	4
the manner of	4
at the head	4
family of polythalamacea	4
the species which	4
are included in	4
you are already	4
the genera contained	4
on the whole	4
with a central	4
in some shells	4
body whorl and	4
be found to	4
are from the	4
point of a	4
work on the	4
history of british	4
here is a	4
the umbones in	4
species of bulla	4
serves the purpose	4
can only be	4
with one or	4
living in holes	4
described in the	4
found in fresh	4
we find a	4
which the genus	4
it forms a	4
closed by an	4
of which a	4
the peculiarity of	4
and the outer	4
of a round	4
then to be	4
species from the	4
genera of the	4
shell on which	4
near the base	4
shells which have	4
obtained from the	4
covered by an	4
cirripedes of lamarck	4
composed of one	4
in the flat	4
several of them	4
made up of	4
having an umbilicus	4
which is only	4
each of which	4
enclose the aperture	4
to of the	4
it are described	4
in distinction from	4
having a series	4
side to side	4
which it has	4
more numerous than	4
is near the	4
the internal cavity	4
univalve shell is	4
of two pieces	4
a manner that	4
small species of	4
with the subject	4
of their shells	4
they are called	4
belonging to it	4
containing no genera	4
to distinguish it	4
cavity in the	4
have been made	4
to the foot	4
the chambers of	4
the attached valve	4
the course of	4
of the whole	4
said to have	4
were brought to	4
a triangular pit	4
the posterior muscular	4
were placed by	4
and also by	4
by the absence	4
touch each other	4
seen when the	4
another view of	4
of the little	4
one recent species	4
by sir william	4
edge of a	4
may easily be	4
of the figures	4
the british species	4
consists of a	4
as in fig	4
generic name proposed	4
as belonging to	4
in a slight	4
the largest of	4
it has the	4
that may be	4
you will have	4
its resemblance to	4
a common species	4
to which are	4
of the volutions	4
the plants in	4
composed of four	4
through the shell	4
this genus by	4
common in the	4
the above name	4
which you may	4
properly to the	4
of marine shells	4
outer lip crenated	4
rare and beautiful	4
the last family	4
the first group	4
taken from the	4
is given in	4
in the market	4
the nucleus of	4
the teeth of	4
of the new	4
of invertebrated animals	4
of which has	4
of the whale	4
the septa are	4
with the shells	4
of the preceding	4
over a part	4
the first division	4
this genus contains	4
figured in the	4
farthest from the	4
some small species	4
in the anterior	4
the cast of	4
we do not	4
of lamarck and	4
the most important	4
and the other	4
and a half	4
and those of	4
de blainville to	4
and you will	4
is very common	4
by some writers	4
anterior extremity of	4
it has a	4
of which they	4
part where the	4
of small teeth	4
texture of the	4
they are of	4
a catalogue of	4
by a siphon	4
new species were	4
of the globe	4
as for instance	4
the skin of	4
is a british	4
each of these	4
as in some	4
lip of the	4
been given to	4
external or internal	4
of a fish	4
the teeth and	4
according to lamarck	4
species of serpula	4
the degree of	4
plants on which	4
applied by some	4
the insertion of	4
terminates in a	4
to the right	4
with the family	4
near the outer	4
corner of the	4
near the anterior	4
distinction from the	4
a fine shell	4
two or more	4
to shew the	4
of which we	4
in the mud	4
which are figured	4
the margins of	4
parietal valves four	4
exposed to the	4
across the cavity	4
this family may	4
a very small	4
by the animal	4
valves of the	4
they are then	4
may be described	4
internal cast of	4
the typical species	4
the only species	4
roots of the	4
curve of the	4
of the internal	4
within the shell	4
be able to	4
at the same	4
are the principal	4
of the bivalve	4
lip thickened and	4
of the different	4
surface of one	4
specimens of the	4
the animal lies	4
containing the families	4
the third section	4
genus of geotrochus	4
in the rock	4
in which to	4
the coast of	4
several other species	4
the order monopleurobranchiata	4
must not be	4
of molluscous animals	4
in having but	4
these may be	4
considered as a	4
the hinder part	4
of which this	4
and has been	4
inner lip is	4
a large and	4
term used to	4
the valves being	4
one end of	4
the under valve	4
genus voluta of	4
the bivalve shell	4
an idea of	4
animals of this	4
the nucleus is	4
some parts of	4
is applied by	4
the new species	4
remarkable for its	4
in the accompanying	4
is well known	4
common garden snail	4
animal has a	4
one of these	4
remains of the	4
to obtain a	4
organs of locomotion	4
the explanation of	4
of teeth on	4
shaped process in	4
the notch at	4
and these again	4
slit near the	4
each of the	4
family may be	4
and lateral teeth	4
the british seas	4
here and there	4
placed at a	4
it is most	4
shell of the	4
the outer edge	4
few in number	4
of our own	4
opening in the	4
is figured in	4
a row of	4
and low water	4
to the size	4
while in the	4
thickness of the	4
in other words	4
and on the	4
the dorsal part	4
they consist of	4
are united in	4
by the large	4
been considered as	4
found attached to	4
is the largest	4
to the umbones	4
now known to	4
to the posterior	4
the specimen is	4
on the whorls	4
the author of	4
the same time	4
impression in each	4
the length is	4
with a deep	4
there are also	4
is placed by	4
the triangular disc	4
the sessile cirripedes	4
and the latter	4
have been considered	4
a canal at	4
very small and	4
a group of	4
regularity of the	4
are characterized by	4
of the mollusca	4
at present known	4
as the apex	4
of the pit	4
separated under the	4
as a specific	4
separated on account	4
outer lip thick	4
is represented in	4
which are characterized	4
in shape and	4
reversed species of	4
met with in	4
the two genera	4
but differing in	4
a shelly tube	4
in the third	4
the spiral cone	4
the thinness of	4
impression having a	4
the cavity of	4
genus derives its	4
from this genus	4
one which is	4
from that genus	4
genus founded on	4
known from the	4
umbo of the	4
whorls of the	4
a fissure near	4
with a spiral	4
with the anterior	4
to the second	4
common on our	4
largest of the	4
a specific name	4
the genera included	4
complete in parts	4
shells are said	4
the stems of	4
is formed of	4
be found on	4
spread over part	4
diverging cardinal teeth	4
bivalves belonging to	4
forms of the	4
genus of fresh	4
the first time	4
rise to the	4
to admit the	4
may be made	4
to the ventral	4
plenty of fossils	4
which the aperture	4
the last genus	4
which consists of	4
also applied to	4
series of sandstones	4
large number of	4
and have the	4
but it is	4
without a sinus	4
from the original	4
that it may	4
roots of trees	4
recognised by the	4
place where the	4
the coasts of	4
impression not sinuated	4
beneath the umbones	4
by a thick	4
the genus voluta	4
in structure and	4
the animals have	4
in a spiral	4
the arrangement of	4
symmetrical conical univalves	4
to include the	4
produced into an	4
species of cardium	4
such species of	4
shells are not	4
desmids and diatoms	4
lip not thickened	4
of a little	4
inner lip reflected	4
the pedunculated cirripedes	4
we find that	4
with three or	4
and several other	4
and divided into	4
fixed at the	4
are known by	4
the british isles	4
from new zealand	4
confounded with any	4
of chambered shells	4
danger of confounding	4
the common name	4
marine substances by	4
are not very	4
to it are	4
in many species	4
spiral at the	4
be distinguished as	4
to some of	4
the irregularity of	4
top edges gilt	4
of which forms	4
as in nautilus	4
to marine bodies	4
to the hinge	4
idea of the	4
the two species	4
teeth and ligament	4
not appear to	4
from the last	4
of the contents	4
the right side	4
attachment of the	4
more ventricose than	4
only on one	4
of the smaller	4
dorsal part of	4
by having a	4
which the shell	4
when they are	4
examples of the	4
on our coasts	4
the birds of	4
on the british	4
are among the	4
species were brought	4
a small portion	4
applied generally to	4
genus is composed	4
centre of each	4
a spiral univalve	4
the next thing	4
to the animal	4
part of this	4
two adductor muscles	4
it is attached	4
point of union	4
enclosed in the	4
in common with	4
the penultimate whorl	4
have been placed	4
which consist of	4
but one species	4
very common in	4
a name given	4
derived from the	4
composed of some	4
in a soft	4
them out of	4
palleal impression having	4
attached to a	4
to those shells	4
this shell is	4
in the inner	4
spire and aperture	4
is brought from	4
they are sometimes	4
been applied to	4
familiar with the	4
opening and shutting	4
of the right	4
ending in a	4
towards the centre	4
is used in	4
is known by	4
a bunch of	4
only genus of	4
by the notch	4
this singular genus	4
with the umbones	4
many new species	4
a hole in	4
in the characters	4
a subgenus of	4
is the last	4
having the anterior	4
by the body	3
with two or	3
species are mostly	3
the umbones and	3
the posterior dorsal	3
tooth near the	3
be taken to	3
hundred and seventy	3
resembling those of	3
is sometimes used	3
may be obtained	3
but they have	3
a notch in	3
order conchifera monomyaria	3
the second division	3
in holes of	3
to present a	3
left in the	3
of exquisitely coloured	3
and other information	3
to include those	3
characterized by the	3
a list of	3
and a posterior	3
cardinal teeth and	3
the animal and	3
divided into separate	3
described in this	3
the situations in	3
operculum is one	3
which are separated	3
have already noticed	3
order to distinguish	3
are already acquainted	3
composing this well	3
is the genus	3
is a handsome	3
bores and inhabits	3
or less globular	3
to indicate the	3
and south america	3
close to it	3
specimen has been	3
is supposed to	3
i think we	3
genus belonging to	3
receives its name	3
has divided this	3
of their shell	3
the geology of	3
together with the	3
for shells of	3
shore line to	3
have been united	3
two valves of	3
the genus bulinus	3
far north as	3
shells should be	3
soon as the	3
of the under	3
a ligamentary pit	3
published at s	3
upwards of exquisitely	3
the internal cartilage	3
england and wales	3
kept in a	3
formed by a	3
genus of uniones	3
takes its name	3
is a remarkable	3
a molluscous animal	3
attached to sub	3
of several small	3
width of the	3
in the water	3
as a whole	3
the other hand	3
disc in the	3
proportion of the	3
the most common	3
three feet in	3
and there a	3
and are found	3
common and general	3
generic characters are	3
small external ligament	3
strata of the	3
impression sinuated posteriorly	3
species of achatina	3
margin of a	3
of a former	3
minute land shells	3
have a thick	3
been separated on	3
the sides are	3
and other authors	3
substance passing through	3
of many of	3
includes all the	3
collections of shells	3
and in damp	3
likely to be	3
shell in a	3
upper valve of	3
with a thin	3
of good hope	3
one adductor muscle	3
often to be	3
the beaks are	3
portion of a	3
thin and brittle	3
the width of	3
has a large	3
like the rest	3
principal difference between	3
the islands of	3
the remainder of	3
ends of the	3
a very common	3
the fruit is	3
through the centre	3
upon a prominent	3
who wish to	3
well as in	3
cavity of the	3
a familiar example	3
all the genera	3
to the left	3
the spiral extremity	3
genus of monodonta	3
having a long	3
to the centre	3
sometimes used as	3
the flat valve	3
a thin epidermis	3
but with the	3
general form and	3
what a number	3
of the rocks	3
name under which	3
is a notch	3
last whorl covers	3
angles to the	3
also by the	3
the south sea	3
the union of	3
the true ligament	3
in reference to	3
to the shore	3
from the latter	3
the command of	3
and other shells	3
having the ligament	3
his genera of	3
enumerated by lamarck	3
not having a	3
other genera enumerated	3
with a slit	3
index of british	3
the animal when	3
from the silurian	3
to prevent its	3
the british shores	3
small teeth on	3
shaped cavity in	3
naturelle des mollusques	3
and advancing beyond	3
the floor of	3
animals of the	3
distinguished as being	3
be more properly	3
in the present	3
are figured in	3
the rock pools	3
they are separated	3
to resemble a	3
composed of eight	3
completely closed by	3
they form a	3
some univalve shells	3
on the body	3
descriptions of new	3
under the umbones	3
in connexion with	3
divided into a	3
layer of shelly	3
have reached the	3
sand and mud	3
three diverging cardinal	3
genus described by	3
proceed to the	3
founded on a	3
piece of cardboard	3
in the original	3
it among his	3
species are natives	3
the idea of	3
of the common	3
in one or	3
central and southern	3
bivalve is said	3
lip very thick	3
which they belong	3
tendon passing through	3
in having an	3
be had separately	3
known as the	3
the part which	3
of a hinge	3
is from the	3
greater number are	3
the individuals of	3
the baculite limestone	3
genus of clausilia	3
in use for	3
shells may be	3
on the under	3
the process of	3
by the point	3
or less oval	3
ponds and streams	3
west india islands	3
it belongs to	3
to close the	3
space between the	3
is a well	3
by those who	3
and consisting of	3
the operculum of	3
by a central	3
on the beach	3
it does not	3
a slit near	3
the pacific ocean	3
the descriptions of	3
and in general	3
or more valves	3
you will recollect	3
are of the	3
situation of the	3
you wish to	3
and that the	3
animal of the	3
by the side	3
the specific name	3
the imaginary axis	3