99 
sides especially the shorter where they are crossed by 
fine striz 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.—Le@viea- 
tTuM. Pen. 4. p. 188. ¢. 54. f. 1.—Da Cos. p. 178. ft. 
13. f. 6.—Don. t. 54.—Mont. p. 80.—Lin. T. 8. p. 
65.—Dor. Cat. p. 31. t. 7. f. 6.—Wood. G. C. t. 
54. f. 1.—D. p. 123.—Tart. D. p. 31.—Inst. t. 332. 
Jf. 169.—Oboval, with a brownish olive glossy epider- 
mis, often marbled with white and the various hues of 
red, with very obscure longitudinal striz 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. Levieatum. Lin. 1123.—Lam. 26.—Ch. ff. 
189.—Knorr. 2. t. 20. f. 4 § 5. £.10.f. 7.—SeErra- 
tum. D. p. 124.—Cirrinum. Wood. G. C. t. 54. f. 
2.—Turt. B. p.192. t. 13. f. 5.—E. p. 423.—Obovate, 
longer than broad, rather oblique, convex, glossy, thin, 
pale yellow with the anterior slope chesnut, with obso- 
lete minute radiating striz except at the sides, inside 
stained with purplish rose-color near the hinge, the 
margin finely serrated. 12...14. W. Coasts. 
E 2 
