lOO AMERICAN JOURNAL 



rad, a Miocene fossil, to M. alta, Conrad, a recent Californian 

 species. The former is proportionally longer and less ventricose 

 than the latter. 



MERCENAEIA. 

 M. PLENA, Conrad. 



Description. — Cordate, inequilateral, ventricose, oblique, with 

 close concentric rugose lines ; posterior side subcuneiform ; lunula 

 ovate ; inner margin densely crenulated. 



Locality/. — Eastern Shore, Md. Prof. Cope. Miocene. 



I am indebted to Mr. Gabb for this species. It approximates 

 M. cajjax, Conrad, but is shorter, less ventricose, more oblique ; 

 the hinge character differs, and the pallial sinus is deeper and 

 more angular. 



LIROSCAPHA, Conrad. 

 Beak terminal erect, acute. 



L. SQUABiosA, Conrad. — PL 9, fig. 23. 



Descriptioti. — Oblong, ventricose, with unequal squamose or 

 spinulose ribs. 



Locality. — Haddonfield, N. J. Rare. 



This is possibly a univalve. It resembles a Crepidula exter- 

 nally, but there is no testaceous lamina within. It may be re- 

 lated to Thylacus, Conrad, figured in the Journal of the Acad- 

 emy, vol. iv, pi. 46, fig. 22. 



CANCELLARIA, Lam. 

 C. SUBALTA, Conrad. — PL 9, fig. 22. 



Description. — Elevated ; whorls 6, convex, first three smooth ; 

 sculpture prominent ; rather close longitudinal ribs crossed by 

 smaller lines, about 12 on the last whorl ; these lines more dis- 

 tant between the suture and shoulder ; labrum angulated above 

 the middle, thickened, strongly toothed on the inner margin ; 

 base slightly produced. 



Locality. — Haddonfield, N. J. 



EULIMA, Risso. 

 E. CRETACEA, Conrad. — PL 9, fig. 15. 



Description. — Subulate, whorls 11 ? slightly truncated at base, 

 except the last volution, which is subangular or acutely rounded 

 medially. 



Locality. — Haddonfield, N. J. 



