22 PALAEONTOLOGY OF CALIFORNIA. 



VENUS, L. 

 V. KENNERLYI, Rve. ? 



PL 5, Fig. 37. 



SHELL thin, subcompressed, rounded-subtriangular ; beaks 

 small, prominent, anterior; anterior and posterior ends about 

 equal ; base broadly rounded ; posterior cardinal margih sloping 

 convexly. Lunule small, elongate cordiform, flat. Surface marked 

 by numerous irregular concentric undulations and fine striae; 

 internal margin entire, not crenulated. Pallial sinus deep, ob 

 lique, and narrow at the base. 



Figure, natural size. 



Locality and position: From the Miocene, at Griswold's, on the road to New 

 Idria, Monterey County. 



I have not had an opportunity of examining Eeeve's figure or description of his 

 species, and from the very meagre note on the species in Carpenter's last Brit. 

 Ass'n Catalogue, I am unable to determine whether this should be referred to V. 

 Kennerlyi, or not. Should it prove distinct, I propose the name of V. pertenuis. 



MERCENARIA, Sebum. 



M. PERLAMINOSA, Con. 



PL 5, Fig. 38. 

 (M. perlaminosa, Con. ; Proc. Phila. Acad. Nat. Sci., 1855, p. 267.) 



SHELL, large, thick, rounded subquadrate, very inequilateral; 

 beaks anterior; anterior end excavated under the beaks, rounded 

 below; base broadly rounded; posterior end convexly truncated ; 

 cardinal margin slightly convex. Surface closely marked by nu 

 merous prominent, recurved, lamelliform concentric ribs. Lunule 

 marked by an impressed line. Hinge robust. Pallial line strong, 

 sinus small, oblique, acuto at the base; muscular scars nearly 



