20 



being to the less about as five is to eight. The whorls are so compactly 

 inrolled that the ventral side of each is indented to about one fourth the 

 thickness of the one preceding. A few obscure undulations are seen on 

 the cast near the aperture. Surface unknown. Transverse width of the 

 last whorl at three lines from the aperture 8 lines ; dorso-ventral depth 5 

 lines ; width of the aperture about 9 lines ; diameter of the whole mea- 

 sured from the median point of the aperture on the dorsum through 

 to the opposite side 13 lines ; diameter at right angles to this latter mea- 

 surement 11 lines. 



This species is allied to B. expansus, Hall, from which it differs princi- 

 pally in having the dorsal aspect flatter, and the aperture not so greatly 

 expanded. English Head, H. R., J. Richardson. It is possible that on 

 the perfect shell the dorsal keel may follow the whorl the whole length, but 

 on the cast of the interior it becomes obsolete at five or six lines from the 

 aperture. 



B. MISER, n. sp. — Shell small with the aperture widely expanded trans- 

 versely. Whorls about two, but only one visible, obscurely carinated 

 along the median line of the dorsum, thence with a flat or gently convex 

 slope to the edge of the umbiUcus, the latter small and with the edges nar- 

 rowly rounded. Surface unknown. Diameter from the median point of 

 the dorsal margin of the aperture through to the opposite side 7 fines ; 

 transverse width of the aperture 9 lines. The specimens are all imperfect. 

 It resembles B. Charon (Can. Nat. Geol. v. 169 ; Geol. Can., 146, fig. 

 97) but is a much smaller species. B. expansus, Sowerby not Hall, is 

 also of the same type. Macasty Bay ; H. R. T. C. Weston. 



B. BiLOBATUS, Sowerby. — Macasty Bay ; H. R. Also Gamache Bay ; 

 Div. 1, A. G. 



B. SOLITARIUS. — About two inches in diameter ; whorls rather strongly 

 ventricose on the dorsum, rounded at the edge of the umbiHcus ; the latter 

 scarcely one-fourth the greater diameter. The aperture is not preserved in 

 the specimen, but it was not, judging from appearances, much expanded. 

 The specimen measures 21 fines across from above downwards ; and 15 

 lines in the tranverse direction. The width on the side opposite the aper- 

 ture is 7 lines and where the last whorl is broken off (evidently very near 

 the aperture,) about 11 fines. Resembles B. fraternus, but is more con- 

 vex on the dorsum and has a smaller umbfiicus. Macasty Bay ; H. R. 



T. C. Weston. 



Genus Cyrtolites, Conrad. 



C. PANNOSUS, n. sp. — Shell small, discoid. Whorls three or four, com- 

 pactly inrolled, the inner ones slightly indenting the outer, all seen in 

 the umbificus, the dorsal aspect with a thin distinctly elevated median 

 keel from which the surface has a gentle slope to the narrowly rounded 



