OF CONCHOLOGY. 43 



the oblique area of the foraminal portion of the beak. It is an 

 Eocene species ; the former Cretaceous. 



Cretaceous species {CrosswicFs group.) 

 INOCERAMUS, Sowerby. 

 I. PECULIARIS, Conrad. — PI. 1, fig. 13. 



Description. — Subequilateral ; ? convex, posterior margin 

 rectilinear, very oblique, extremity angular ; ribs prominent, 

 concentric. 



Locality/. — Crosswicks, N. J. 



A single fragment is all I have seen of this peculiar species. 



CBASSA TJELLIDjE. 



ORASSATELLA, Lam. 



C. PRORA, Conrad. — PI. 1, fig. 8. 



Description. — Triangular, length much greater than the 

 height, subequilateral, slightly ventricose ; anterior end regu- 

 larly rounded, and nearly equal to the posterior, which is trun- 

 cated ; beaks prominent, umbonal slope rounded, undefined ; 

 surface marked by concentric furrows (cast). 



Locality. — Crosswicks, N. J. 



Vetocardia crenalirata, Conrad. — PI. 1, fig. 23. 

 Astarte corbicula, Amer. Journ. Conch, vol. iii, p. 12. 

 Locality. — Haddonfield, N. J. 



ARCID^E. 



TRIGONARCA, Conrad. 



T. PASSA, Conrad.— PI. 1, fig. 17. 



Description. — Subovate, elongated, inequilateral, ventricose, 

 anterior end regularly rounded ; umbonal slope sharply angular ; 

 posterior slope depressed, concave ; surface minutely and ob- 

 soletely radiated ; beaks distant from the anterior margin : pos- 

 terior extremity truncated or slightly emarginated. 



Locality. — Crosswicks, N. J. 



GONIOSOMA, Conrad. 



An equivalve bivalve with prominent beaks and entire 

 pallial line ? the muscular impressions terminal, posterior one 

 round ; hinge (in the cast) with two prominent cardinal teeth, 



