130 ROYAL SOCIETY OF CANADA 
millimetres apart on and near the periphery, but the flat, smooth inter- 
vals between them gradually become wider and wider, until at last the 
ribs in the same region, near the aperture, are as much as seven milli- 
metres apart. 
A characteristic fragment of this species was collected by Mr. Harvey 
in 1892. on the northwest side of Hornby Island. 
ANISOCERAS VANCOUVERENSE, Gabb. (Sp.) 
Hamites Vancouverensis, Gabb. 1864. Geol. Surv. Calif., Palæont., vol. i., p. 70, 
pl. 13, fig. 18. 
Northwest side of Hornby Island, W. Harvey, 1893: one good speci- 
men, upwards of five inches in length and four in its greatest breadth, 
which is now in the possession of the Provincial Museum at Victoria, B.C. 
The maximum diameter of the shelly tube of which it is composed is 
forty-five millimetres. The “prolonged portion,” as Stoliczka calls it, is 
much longer than the ~* reflected portion,’ and the former is slightly 
incurved posteriorly. 
A much more perfect specimen, which measures nearly eight inches 
in its maximum length, and which has been described and figured in 
the “Canadian Record of Science” for April, 1895, has been collected 
quite recently by Mr. Harvey at Hornby Island. This specimen shows 
that the earlier portion of the shell in this species is narrowly elongated, 
sinuous, spirally twisted and curved obliquely outward, as in Anisoceras, 
before becoming straight and prolonged, and that it does not consist of a 
slender shelly tube bent twice or more upon itself, as in Hamites. 
HAMITES OBSTRICTUS, Jimbo. 
Hamites cylindraceus, Whiteaves. 1879. Geol. Surv. Canada, Mesoz. Foss., vo. i., 
pt. 2, p. 118, pl. 14, figs. 2 and 2a, but not H. cylindraceus 
of Defrance or D’Orbigny. 
Hamites obstrictus, Jimbo. 1894. Beitr. zur Kennt. der Fauna der Kreideform. 
von Hokkaido, in Dames and Kayser’s Palæontol. Abhandl., 
n. ser., vol. vi., p. 38, pl. 7 (23). figs. 2, 2, a-b. 
Posterior extremity of the shell unknown, the prolonged and reflected 
portions slender, straight, almost circular in outline in transverse section, 
unless when abnormally compressed, and separated from each other by a 
space about equal in width to the maximum diameter of the reflected 
portion, near the aperture. 
Surface marked by prominent, narrow, simple and rarely bifurcating 
transverse ribs, which are rounded at their summits and separated by 
rather deep concave furrows. Besides the ribs, or rather furrows, there 
is a single transverse constriction on the reflected portion of the shell. 
On the prolonged portion the ribs are about one millimetre apart, but on 
the reflected portion they are nearly two millimetres apart. 
nd 
