[WHITEAVES] VANCOUVER CRETACEOUS FOSSILS 123 
but slightly descending in front of the beaks, and sloping obliquely and 
much more rapidly downward behind them; beaks small, incurved and 
recurved, projecting very little above the highest level of the superior 
border, placed behind the midlength, and in one specimen almost ter- 
minal. 
Surface almost smooth, marked only by a few faint concentric striæ 
of growth; test thin. 
Dimensions of the largest specimen known to the writer: length, 
eleven millimetres ; height, eight millimetres. The specimen figured is 
not quite six millimetres in length. 
Northwest side of Hornby Island, in the “Middle Shales or Division 
D” of Mr. Richardson’s Comox Section, W. Harvey, 1894: one right 
valve, one left valve, and a somewhat crushed specimen with both valves, 
each with the test preserved. 
These specimens may represent a variety of Nucula solitaria, but if 
Mr. Gabb’s figure of that species is correct it must have a very different 
marginal outline. His illustration represents a much more triangular 
shell than that of N. Hornbyensis, with a more prominent beak, and more 
pointed at both ends. 
Nucula Traskana, Meek, from the Cretaceous rocks of Vancouver 
Island, was described from a single worn cast of the interior of the shell, 
which has never been figured and has since been lost. Mr. Meek states 
that the specimen was “probably provided with a distinct lunule,” and 
that “the species will probably be recognized by its ventricose trigonal 
ovate form and nearly central beaks.” This description is quite inapplic- 
able to the specimens from Hornby Island, in which the lunule and 
escutcheon are both obsolete. 
CLIsocoLUS puBius, Gabb. 
Loripes dubius, Gabb. 1864. Geol. Surv. Calif., Palæont., vol. i., p. 177, pl. 24, figs. 
170 and 171. 
Clisocolus dubius, Gabb. 1869. Geol. Surv. Calif., Palæont., vol. ii., p. 189, pl. 30, 
Kes, Uo 
Lucina Richardsonii, Whiteaves. 1874. Geol. Surv. Canada, Rep. Progr. for 1873- 
1874, p. 266, pl. of foss., fig. 1. 
Thetiopsis circularis, Whiteaves. 1879. Geol. Surv. Canada, Mesoz. Foss., vol. i, 
pt. 2, p. 153. 
Clisocolus dubius, White. 1889. Bull. U.S. Geol. Survey, no. 51, p. 41, pl. 6, figs. 5-7. 
The specimens from Vancouver, Hornby and the Sucia islands, 
which the writer first described as Lucina Richardsonii, and afterwards 
referred to the Thetis circularis of Meek and Hayden, the type of Meek’s 
suggested genus Thetiopsis, are obviously identical with the Clisocolus 
dubius as since figured by Dr. C. A. White, and with specimens from the 
Chico group of Shasta County, California, labelled C. dubius, and kindly 
loaned by Mr. Stanton. It still, however, appears to the writer that the 
