([WHITRAVES| VANCOUVER CRETACEOUS FOSSILS 121 
INOCERAMUS DIGITATUS (Sowerby) Schmidt. 
Tnoceramus digitatus (Sowerby), Schmidt. 1873. Petref. Kreideform, Insel Sacha- 
lin, in Mem. Ac. Imp. des Sc. de St. Petersburg, vol. xix., 
no. 3, p. 25, pl. 5, figs. 10 and 11, and the whole of pls. 6 
and 7. 
Inoceramus undulatoplicatus (F. Roemer), Schluter. 1877. Kreide-Bivalven. Zur 
Gattung Inoceramus, p. 22, pl. 3, fig. 1. 
eS Le Whiteaves. 1879. Geol. Surv. Canada, Mesoz. 
Foss., vol. i., pt. 2, pl. 168, pl. 20, figs. 2 and 2a. 
Inoceramus digitatus (Sowerby), Jimbo. 1894. Beitr. zur Kentniss der Fauna der 
Kreideform. von Hokkaido, in Dames and 
Kayser’s Palæont. Abhandl. (Jena), Neue 
Folge, Band ii., heft 3, p. 43, pl. 8 (24), figs. 8-10. 
The specimens of this species collected by Mr. Richardson on Van- 
couver Island in 1871 and 1872, and referred to in the second part of the 
first volume of the “ Mesozoic Fossils,” are nearly all of small size, though 
one individual, as there stated, is fully five inches and a-half in height. 
Some of them are higher than long, with a short hinge-line, and others 
longer than high, with a long hinge-line. Their sculpture also is equally 
variable, and consists either of continuous, concentric or radiating and 
divergent plications, or of corresponding rows of tubercles, in addition to 
the lines of growth. 
In a paper on “ Cretaceous Fossils from the Vancouver Island region,” ' 
Dr. C. A. White doubts the correctness of the identification of the speci- 
mens collected by Mr. Richardson with J. undulato-plicatus, but they agree 
very well with Roemer’s description, though perhaps not quite so well 
with his figure of that species. 
However this may be, several small Jnocerami, which are evidently 
conspecific with those collected by Mr. Richardson, were obtained by Dr. 
C. F. Newcombe in 1892 on the Comox River, V. I., and kindly pre- 
sented by him to the Museum of the Geological Survey. With one excep- 
tion, these specimens from Comox are all longer than high and have a 
long hinge-line. Their sculpture consists of concentric plications, which 
are rarely quite parallel with the closely and regularly disposed impressed 
lines of growth, upon the umbonal and central regions of each valve, and 
of radiating and divergent folds anteriorly. 
The only specimen collected by Dr. Newcombe on the Comox River 
that is higher than long, with a short hinge-line, has very peculiar sculp- 
ture. In addition to the ordinary growth-lines, a nearly central and con- 
tinuous longitudinal plication runs from the beak of the left valve (the 
only one preserved) to the base, a little in advance of the centre of the 
latter. On the anterior side, five simple plications radiate obliquely for- 
ward and outward from this subcentral fold, and on the posterior side 

1 Bull. U. S. Geol. Surv., No. 51, pt. 3, p. 37. 
