342 Fossil and Recent Shells. 



VENERUPIS. 



V. suhvexa. Shell subglobose, rather thin and fragile ; beaks 

 central, elevated and inclined a little forwards. Length, one inch. 

 Locality. — James river, near Smithfield, Va. Upper marine. 



CARDITA. 



C. alticostnta. Shell subcordate, convex, with about twenty two 

 profoundly elevated nodulous ribs, which on the anterior side are 

 laterally carinaled. Length, two inches. 



Locality. — Claiborne, Alab. London clay. Extremely abun- 

 dant and very variable in outline. 



ASTARTE. 



1. A. iellinoides. Shell oval, with concentric sulci; posterior 

 side with a slight groove or fold terminating in a slight emargination 

 of the basal edge ; umbo flattened ; apex acute but not prominent ; 

 muscular impressions a little elevated and very distinct. Length, half 

 an inch. 



Locality. — Claiborne, Alab. London clay. 



2. A. ungulina. Shell slightly elevated or obovate, a little con- 

 vex, with fine concentric sulci becoming obsolete with age ; beaks 

 inclining a little forward and the apex acute ; inner margin entire ; 

 lunule none. Length, half an inch. 



Locality. — Accompanies the preceding species. 



PECTUNCULUS. 



1. P. cuneus. Shell cuneiform, broad, posterior end flattened 

 and forming an angle at the umbonial slope. Length, half an inch. 



This is a remarkable species, very unlike any I have hitherto seen. 

 Locality. — Claiborne, Alab. London clay. 



2. P. trigonella. Shell subtriangular, elevated, with radiating 

 striae ; anterior margin nearly rectilinear and subangular at the ex- 

 tremity ; inner margin serrate. Length, half an inch. 



Locality. — Claiborne, Alab. London clay. 



3. P. stamineus. Shell suborbicular, ventricose ; with distant ra- 

 diating and finer intermediate lines, crossed by minute crowded strise; 

 inner margin serrate. Length, one inch and a half. 



Locality. — Found with the preceding species. 



