99 



sides especially the shorter where they are crossed by 

 fine striae which pass over but do not cut the ribs; 

 one of the cardinal teeth minute or obliterated in each 

 valve. Torquay, not rare. 



C. SERRATUM. Lin. 1123. Lam. 25. LCBVIGA- 

 TUM. Pen. 4.p. 188. t. 54./. I. Da Cos. p. 178. t. 

 13. f. 6. Don. t. 54. Mont. p. SO. -Lin. T. 8. p. 

 Q5.Dor. Cat. p. 31. t. 7. f. $. Wood. G. C. t. 

 54. /. 1. D.p. \23.-Tnrt.D.p. 31. List. t. 332. 

 /. 169. Oboval, with a brownish olive glossy epider- 

 mis, often marbled with white and the various hues of 

 red, with very obscure longitudinal striae and very re- 

 mote transverse ones ; flattish and much produced ante- 

 riorly where the striae become obsolete ; within, pale 

 flesh color. 2 ... 1 ,67. Common. 



C. LEVIGATUM. Lin. 1123. Lam. 26. Ck. f. 

 l$9.Knorr. 2. t. 20. /. 4 <J- 5. . 10. f. 7. SERRA- 

 TUM. D.p. 124. CITRINUM. Wood. G. C. t. 54. /. 

 2.Turt. B.p. 192. t. 13./. 5.F.p. 423. Obovate, 

 longer than broad, rather oblique, convex, glossy, thin, 

 pale yellow with the anterior slope chesnut, with obso- 

 lete minute radiating striae except at the sides, inside 

 stained with purplish rose-color near the hinge, the 

 margin finely serrated . 1| . . . l| . W. Coasts. 



E 2 



