40 ameeiCj^ journal 



the umbonal slope, -which is angular ; ribs narrow and divided 

 by a longitudinal sulcus, intervening spaces wider than the ribs ; 

 posterior area obliquely depressed ; ribs about seven in number, 

 flattened and little prominent; posterior end obliquely truncated: 

 hinge area wide, with many closely arranged subangular im- 

 pressed lines ; cardinal plate very narrow, almost linear ; teeth 

 small, nearly obsolete. 



Locality. — Talbot Co., Md. Prof. Cope. 



I am indebted to Mr. Gabb for the above species, as well as 

 Cajjsa parilis. 



SAXICAVA, Bellevue. 



S. INSITA, Conrad. 



JDescription. — Trapezoidal ; posterior hinge margin straight, 

 long and slightly oblique ; end margin truncated and slightly 

 oblique, extremity sharply angular ; umbonal slope angular. 



Locality. — Eastern Shore, Maryland. Prof. Cope. 



This small smooth species was found in abundance, perforating 

 a fragment of the large Pecten Jeffersonius. It has bored 

 entirely through the shell, and the valves may be seen from the 

 small round or oval holes on the interior side of the Pecten. 

 Length one-sixth inch. 



CAPS A, Brug. 



C. PARILIS, Conrad. — PI. 2, fig. 3. 



Pescription. — Subtriangular, equilateral, ventricose ; right 

 valve irregular on the surface, concentrically rugose-striated ; 

 anterior and posterior sides nearly equal in size, rounded on the 

 margins. 



Locality. — Eastern Shore of Maryland. Prof. Cope. 



Eocene Species. 

 PEGTINIPJE. 



PECTEN, Linn. 

 P. KNEISKERNI, Conrad. — PI. 1, fig. 18. 



Description. — Ovate, convex, ribs 13, convex, little prominent ; 

 anterior and posterior submargins without ribs ; ears equal. 

 (Cast). 



Locality. — Shark River, N. J. 



