18 

 Genus Mubchisonia, D'Archiac et D'Verneuil. 



M. GRACILIS, Hall. — Charleton Point and numerous other localities ; 

 H. R. Also at Cape Sand-top Baj; Div. 2, A. G. 



M. VENTRicosA, Hall. — A species not distinguishable, in casts, from 

 this occurs at English Head ; H. R. Also at Gamache Bay ; Div. 1, A. G. 



M. TERETiFORMis, B., op. cit., p. 298. — Charleton Point; H. R. 



M. RUGOSA, B., op. cit., p. 299. — English Head ; H. R. Also abund- 

 antly at Gamache Bay; Dir. 1, A. G. 



M. MULTivoLvis, B., op. cit., p. 299. — Macasty Bay; H. R. 



M. MODESTA, B., op. cit., p. 299. — English Head and Macasty Bay ; 

 H. R. 



M. VARiANS, B., op. cit., p. 300. — English Head ; H. R. 



Genus Metoptoma, PhilHps. 



M. Alcbste, B., op. cit., p. 153. — English Head ; H. R. 

 M. EsTELLA, B., op. cit., p. 153. — English Head ; H. R. 



HETEROPODA. 



Genus Bellerophon, Montfort. 



B. ACUTUS, Sowerby. — Macasty Bay and English Head ; H. R. Ga- 

 mache Bay ; Div. 1., A. G. This type (of a peculiar group of species of 

 the genus) makes its first appearance so far as is yet known, in the Calci- 

 ferous formation {B. maoer, Pal. Foss. vol. i, p. 346). It occurs next 

 in the L^vis formation (B. Palinurus, op. cit., p. 311). And again in 

 the Black River hmestone where we have (5. disculus and B. Argo, 

 Geol. Can. p. 146). 



B. Canadensis, n. sp. — Shell large with a greatly expanded aperture. 

 Whorls two or three, but only the last one visible, strongly ventricose and 

 sub-angular on the dorsal side, carinated ? along the median line ; umbih- 

 cus at its margin about one-third the diameter of the whorl. Surface, on 

 the dorsal side, with obscure ridges which radiate from the median line 

 towards the margin of the aperture ; they are scarcely visible on the body 

 of the whorl, but become very prominent on the outer surface of the ex- 

 pansion of the aperture. In some specimens, also, they alternate in size. 



On the surface of the body whorl there are indications of smaller trans- 

 verse ridges giving an obscurely cancellated appearance. Width of the 

 expansion of the aperture about 3 inches. When placed with the aperture 

 downwards the height of the most elevated point of the whorl is 18 hnes. 

 Macasty Bay ; H. R. T. C. Weston. 



