76 AMERICAN JOURNAL 



VELUTINID^E. 



LEPTONOTIS, Conrad. 



Description. — Sub-oval or sub-rotund; apex distant from 

 the margin ; peristome continuing around the body of the vo- 

 lution to near the base of the columella. 



Velutina (Olina) expansa, Whitfield. — Amer. Journ. Conch., 

 Vol. L, p. 265, pi. 27, figs. 14, 15. 



This genus differs from Velutina in the remarkable expan- 

 sion of the outer lip, and the distance of the apex from the 

 margin. It was probably unlike Velutina, an inhabitant of 

 deep water. 



MACTRID^E. 



CUMINGIA, Sowerby. 



C. borealis, Conrad. — Gould's Invert, of Mass., fig. 36. 



This shell has long been referred to the fossil G. tellinoides. 

 Con., but it is greatly inferior in size, and the height is less in 

 proportion to its length. It inhabits the coast of Massachu- 

 setts; South Carolina, on the authority of Dr. Ravenel. 



CORBULIBvE. 



CORBULA, Lam. 

 C. aliformis, Conrad. 



Description. — Elongated, oblique, very inequilateral, with a 

 sinuous anterior margin ; hinge margin with a linear groove 

 posteriorly ; smaller valve unknown. 



G. alta, Conrad. — Journ. Acad. Nat. Sciences, 2d Series. 

 Vol. II., pi. 1, fig. 3, (not G. alta, 2d Series, Vol. I., pi. 12^ 

 fig. 33.) 



This shell belongs exclusively to the Shell Bluff group, and 

 is very distinct from G. alta of the Vicksburg group. 



TELLINID^E. 



MACOMA, Leach. 

 M. VIRGINIANA, Con. 



This species is extinct, and may be distinguished from M. 

 lusoria by being proportionally more elevated, rounded at base, 

 and less compressed and reflexed anteriorly. In "Fossil 

 Shells of the Tertiary Formations," this species is described 

 as T. lusoria, Say.* 



* Inhabits the coast of New Jersey. 



