104 AMERICAN JOURNAL 



DESCRIPTIONS OP NEW SPECIES OP TERTIARY, 

 CRETACEOUS, AND RECENT SHELLS. 



BY T. A. CONRAD, 



CRASSATELLID^. 



CRASSATELLA. 



C. PERALTA, Conrad.— PI. 8, fig. 1. 



Descri2')tion. — Subtriangular ; height rather more than the 

 length ; convex ; cardinal margin oblique ; posterior margin 

 widely subtruncated, with a slightly inward slope. 



Locality. — G.oshen, Cape May Co., N. J. Mr. Ashmead. 



Observations.— -A. very perfect ferruginous cast of this species 

 from a new locality, which I suppose to be Miocene, was found 

 in company with the following species, a less perfect cast. 

 They are widely dissimilar to other known species. 



G. PLANATA, Conrad. — PI. 8, fig. 4. 



Description. — Subovate, compressed, anteriorly obliquely 

 truncated inwards; posteriorly slightly produced ; extremity 

 nearly medial in relation to the height of the shell. (Cast.) 



C. CURTA, Conrad.— PL 8, fig. 2. 



Description. — Subtriangular, convex ; rather longer than 

 liigh ; posterior end truncated, direct ; ventral margin rounded 

 in the middle, rectilinear posteriorly ; cardinal plate broad. 



G. curta, Conrad. — Proceed. Acad. Nat. Sciences, 1862, p. 

 578. 



Locality. — Virginia ? 



VENBRID.E. 



MERCENARIA, Schum. 



M, OBTUSA, Conrad.— PI, 8, fig. 3. 



Description. — Cordate-triangular, very inequilateral, thick 

 and ponderous, ventricose, densely covered with reflexed la- 

 minated concentric lines, and with obsolete radiating lines in 

 the middle of the valves ; posterior end obtusely rounded, the 

 extremity truncated either direct or obliquely inwards ; beaks 

 prominent ; lunale large, cordate, impressed ; inner margin 

 densely crenate ; anterior cicatrix large and profound. 



