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Descriptions of two new species of Ammo-
nites from the Cretaceous rocks of tiie
Queen Charlotte Islands.

By J. F. Whiteaves.

?->*

mfmmmm

Descriptions of two new species of Ammo-
nites from tine Cretaceous rocks of the
Queen Charlotte Islands.

By J. F. Whiteaves.

RECORD or SCIENCE.

PLATE VII.

^ «

/«

■|S

1 ',

■^ -^'

L. Ml ambe . del O.E.Pr ud Homme.liLh

AMMONITES FROM Q.C. ISLANDS.

Reprinted from the Canadian Record of Science, October, 1893."

Columbia, the

o (JretaceouH

3 the writer

•U there are

ici'ibed, both

Descriptions of two new species of Ammo-
nites from the Cretaceous rocks of the
Queen Charlotte Islands.*

By J. F. VViiiTBAVKS.

Through the courtesy of Dr. C. F. Neweombe, of Victoria,
V. I., and by kind permission of f inr" and members

of the Natural History Society
whole of their collection of the
rocks of that province has recently
for examination and study. Araon^i,
two small Ammonites which appear to t>«
of which are labelled as having been collected at Skidegate
Inlet, {I <'. I., and presented to the society by Mr. James
Deans. Jioth are clearly referable to the family of Stephano-
ceratida' of Neumayr, as amended or re-defined by Zittel.
One is an imperfect specimen of a small species of Olcoste-
phanus, nearly related to 0. Jeannotti (the Ammonites Jean-
uotti of d'Orbigny ') of the Neocomian of Prance and Switz-
erland. The other is a mce perfect but apparently not
quite iull-grown specimen of a species of Hoplites, of the
type of H. sinuosus (the Ammonites sinucsus of d'Orbigny •)

' Pal6ont. Franc. Terr. Cret., vol. i, \u 188, pi. 56, figs. 3-5. .'•,•• *.

'•!Ib.,p. 204,pl.6O, fig8.1-3. *. ^, *. . • .;

* Communicated by permigsion of the l)ireotor ot the Geplogjc^l
Survey Department. * •'.*.•,, .* '• '.

• * •

t r 1

442

Canndian Record of Science.

of the Fronch Xeocomiun. Tho exact clmiact«rH of the
sutuiul line are unfortimatoly not well Hhown in either of
these HpecimonH. The two Hpocios ropreHented may be pro-
visionally described as follows, with the proviso that the
diagnoses of each are, of course, siibjoct to such modifi-
cations or amplifications as may bo made necessary by the
discovery of more perfect spoeimens.

• • • •

' * >

Olcostepiianus (Astibria) Deansii. (Sp. nov.)
Plata V[ J, figs, land la.

Shell small, compressed at tho sides and narrowly rounded
at the ])eriphery : umbilicus occupying rather Ies8 than one-
third of the entire diameter. Volutions three or four, in-
creasing rapidly in size, espi iaily in the dorso-lateral direc-
tion, and rather closely embracing, about two-thirds of the
sides of the inner ones being coveiod, tho outer one a little
higher than broad : aperture elliptical m outline but deeply
emarginato l)y tho encro:;chmeiit of the preceding volution.

Surface marked by numerous, closely arranged, small
but distinct, though not very prominent, flexuous, trans-
verse i-ibs, which bifurcate about tho middle of tho sides and
then pass uiiintonuj>todly over the periphery.

Tiio sutural lines are so crowded togoth<ir .md confused
that, although faii-ly well preserved in places, it is scarcely
possible (o follow the details of any single one. Tho
siphonal ssuldlo, however, is small, a littlo higher than
broad, with a minutely trifurcato a])Ox, and an appressod
spur on each side below. The fii-st lateral saddle is large,
ramose and unequally bipai-tito or obscurely tripartite at
its summit. Tho siphonal lobe is large and symmetrical,
with three branchlets on each side, two of which are lateral
and one terminal, but the lowest of tho two pairs of lateral
branchlets is much the smallest of the throe pairs.

Tho only specimen collectbd is considerably eroded near
tho apertui-o, as represented i fig. 1, but in the uneroded
!)ortion the maximum diameter is about forty millimetres,
»i.d the groatost breadth fourteen,.

DescrifUionx of Two New Species of immonilGs. 443

The wriiei- han much plonsme in UHHociuting wit:, ^bis
special t'je nuniv. of Hh diHCMvorer, Mr. .lanio.s \)mm of
Vlcforiii, V. I., who accoinpaniod Mr. Jamos Ri( hardnon in
his exploration of the Queen » harlotte iHlandw, in 1872, and
who has since proseotod some unusually perfect speaimens
of the fossils of the Crotaceous roc'cs of those islands to the
riiuseum of the Geoloi,'ioal Survey Department at Ottawa.

Dean&ii appears to belong to the small group of Am-
monites of which Oli'ostephanus Astim is the type, and for
which M. Pavlow has recently (1891) proposed the generic
or .ibgcnoric r,ame Actieria' According to M. I'avlow, the
Olcostephani of the group of 0. Astien form u natural
group, a ge;fus (Asfienn) if one pr'ifers to consider the
Oicostephani as a family, or v. subgenus if one would rather
regai'tl Olc -ephanus as a genus.

The shape and surface ornamentation of O. Deamii are
very similar to those of 0. Jennnottl. \\\x\ ' C Jeannotti
the ribs bifurcate nt the umbilical margin, and are repre-
sented as so prominent as to everywhere break the general
contour if the shell is viewed laterally. The siphonal
saddles of 0. Jeannotti, ♦oo, are described as broad, and the
figures show that they are much broade. than high. In 0.
Deansii, on the other hand, the ribs bifurcate half way
way Jioross the sides, at a considerable distance from the
umbilical margin, and are not sufficiently promitient lo
interrupt the continuity of the outline of the sboll in a lull
side view. The siphonal saddles of 0. Deansii, also, are
narrow and, as already stated, a little higher than broad.

The genus Olcostepkanus, which was founded by Neumayr
in 1875, is abundantly represented in the Uppci Jurassic
and Lower and Middle Cretaceous rocks of Kurope. The
only other species (hat has been definitely recorded from
the Canadian Cretaceous is 0. Loganianus (nobis), from
Skidegato inlet, whose characters are still very imperfectly
known. As stated elsewhere," however, it is most jjrobable
that the so-called Haploccras Ciimshewaevse (nobis), from

' Bull. Soc. Imp. Naturalistea de Moscoii, Annde W,)\, N- >Str., vol, v, |), 491,
- Trans. Royal Soc. CsJia4a, yol. ^, pect. iv, p. 114,

444

Canadian Record of Science.

Cinnshevva Inlet, belongn to that section of the genus Olco^
stephan-' , for which M. Pavlow has since proposed the sub-
genus Virgatites}

HoPLiTES Haidaquensis. (Sp. nov )
Plate VI [, tigs. 2, 2 rt it 2 6.

Shell small, strongly costate and widely umbilicated,
the umbilicus, as measured from suture to suture, occupy-
ing about one-third of the entire diameter. Volutions
about three, though the nucleus is not preserved in the
only specimen collected, increasing rather rapidly in size
and slightly embracing: the outer one moderately convex,
a little broader than high, the outline of a transverse sec-
tion being subpentagonal if made through one of the ribs,
or not far from circular if in the centre of one of the grooves
between them : aperture nearly circular but shallowly emar-
ginate by the enci-oachment of the preceding volution.

Surface marked by lai-ge and prominent, simple^, and
nearly wtraight, transverse ribs, which are separated by
I'ather bi-oad concave grooves. The ribs, which are equal
ii. length, are most elevated on the outer or peripheral por-
tion of the last volution, and in the median line of the peri-
phery there is a single angular notch on each rib which
scarcely interrupts the continuity of the r'b.

vSutural line not clearly defined, but apparently not very
complicated nor much branched. The first and second
lateral saddles appear to be much broader than high, and
<loubly incised rather than ramose at the summits. The
first lateral lobe seems to be trifurcate above and unusually
small, though apparently much larger than any of the
others except the siphonal lobe.

Maximum diameter of the only specimen collected,
twenty nine millimetres: greatest breadth of the same,
twelve mm.

The specific name suggested for this little Ammonite is a
modification of the word Hai-dakwe-a, which Dr. G, M.
op. oit , p. 47i

Descriptions of Two New Species of Ammonites. 445

Dawson quotes as the Indian name for the Queen Charlotte
Islands, in his report on these islands, published in the
lieport of Pi'ogress of the (ieological Survey of Canada for
1 878 79.' The shell itself appears to belong to the sub-
group Dentati-i jgulares of the Dentati. of Pictet's classifi-
cation of the Ammonites in the ' l'al<iontologie Suisse," ^
and to that section of the genus Hoplites which Zittel calls
the group of Ammonites interruptus? In many of its char-
acters it is veiy similar to Hoplites sinuosus, but it seems to
have fewer and more distant ribs than that species and a
different sutural line. Thus the type and only known
specimen of B. Haidaquensis has twenty-two ribs on the
outer volution, while that of H. sinuosis, which is almost
exactly the same size, is said to have thirty-four. The
sutural line of H. Haidaquensis seems to be more like that
of H. crassicostatus, as figured by d'Orbigny,* in which the.
first and second lateral saddles are represented as broader
than high, whereas the corresponding saddles of H. sinuosus
are represented as higher than broad.

The genus Hoplites also was proposed by Neumayr in
1875, and is regarded as eminently characteristic of the
Cretaceous epoch. //. Haidaquensis and H. Canadensis
(nobis),^ from the Clearwater shales and Peace Eiver sand-
stones of the district of Athabasca, are typical and chai-ac-
teristic Canadian species of this genus. H. McConnelli^'
(nobis), from the ( 'learwater shales of the Athabasca, ap-
pears to be rather an aberrant member of that section of
the genus which Zittel calls the "group of Ammonites crypto-
ceras." It is also most probable that the fossil from Coraox,
Vancouver Island, which Meek doubtfully referred to his
genus Placentieeras, under the name P. Vancouverense,' is
also referable to Hoplites.

» p. 104 B.

^ Prem. partie, p. 328.

^ Handb. der Palueont., vol. ii, p. 476.

* Pal^ont. Franc, Ter. Cret., vol. i, aUas, pi. 59, fig. 3.

f" Trans. Royal See. Canada, vol. x, sect, ivi p. 118, pi. xi, tigs. 3-5.

«Ib.,p, 117, pi. xi, figs. 2,2 a rf-/).

' Bull. Geol. and Qoog. Surv. Terr., vol. i, No. 4, p. 370) pi. vi figs. 1, 1 a-c

440

Canadian Record of Science.

With the jjermission of Mr. Deans, the types of the two
species desei-ibed in this paper have hoeti presented to the
museum of the Geological Survey by the membei-s of the
Natural IFistory Society of British Columbia.

EXPLANATION OF PLATE VIL
Oi.cosTKrnAxus (Astiehia) Dkansk.
Fi^r. 1.— Side view of tlie only specimen collected.

la.— Outline of the same, from another point of view, to show
the proportionate breadth of the shell and probable
shape of its aperture.

HoPLiTEs Haidaqiensis.
Fig. 2.— Side view of the only specimen collected.

L'a.— Another view of the same, to show the characters of the

peripheral region, near the aperture.
26.— Front view of the same, in outline, to show the shape of
the aperture, etc. All the figures of natural size.