TRIBE CARDIACEA. 133 
thirty-five depressed ribs, ef which the first few anterior ones are 
flat and imbricated, a few posterior ones flattened and without the 
numerous scaly striz, which cross the central ribs, which have one 
side rounded and are angular on the other. 43.—S. Carolina. 
C. Rucosum. Lam. 23.—C. I. f. 32, 39, 41.—Ch. f. 191. 
—K. t. 297. f. 2.—An. C. Fravum? Lin.—W.t. 5. f. 24. 
Ovate, slightly rounded, longer than broad, inequilateral, whitish 
(with sometimes a rusty or tawny tinge) with from twenty-eight to 
thirty-two rounded and transversely wrinkled ribs which anteriorly 
are rough with scales. 24..24.—Ceylon, Java.! 
C. Sutcatum. 24.—C. Serratum. Brug. p. 229.—C. Os- 
toneuMm. WD. p. 122.—Ch. f. 190.—H. t. 298. f. 5.—W. t. 5. 
f. 23.—C. Fuavum. Born. t. 3. f. 8. Longitudinally oblong, 
inequilateral, turgid, greenish yellow with the beaks reddish and 
smooth, grooved longitudinally except at the sides which are nearly 
smooth and the anterior one depressed; umbones obliquely in- 
curved towards the posterior side, and the inner margin serrated. 
3..21.— Mediterranean. 
C. Levieatum.* Pennant.—Lin. 1123?—D. p. 123.— 
Wood. G. C. t. 54. f. 1.—W. t. 5. f. 21.—Don. 2. t. 54.— 
C. Serratum. Lam. 25.—List. t. 332. f. 169. Obliquely 
triangular, obovate, longer than broad, pale chesnut or brownish 
under an olive epidermis, anterior slope obliquely subtruncated, 
with obsolete radiating ribs except on the sides: pale flesh-colour 
within. 2..13.—Hngland. 
C. Serratum.* Lin, 1123.—D. p. 124.—C. Lavicatum. 
Lam. 26.—Ch. f. 189.—Turt. Biv. t. 13. f. 5.—<Knorr. 2. 
t. 20. f. 4. § 5, ¢. 10. f. 7.—C. Cirrinum. Wood. G.C.t. 54. 
f. 3.—W. t. 5. f. 22. Obovate, longer than broad, rather oblique, 
convex, glossy, thin, pale yellow with the anterior slope chesnut, 
with obsolete minute longitudinal striz, except at the sides, a pink 
stain in front of the beaks: within stained with purplish rose near 
the hinge, the margin finely serrated. 13..14.—W. Indies, Sc. 
C. Brrapiatum. Brug. Dict. p. 231. no. 28.—Lam. 27.— 
C. Lineatum. D. p. 123.—Ch. f. 185, 6.—E. t. 298. f. 6. 
Ovate oblong, compressed, longitudinally striated, white with large 
orange or reddish spots and sometimes with irregular interrupted 
bands of the same colour: white within, with two purple rays ex- 
tending two-thirds downwards from the beaks. 2..15.—Ceylon. 
C. Moxricum. Lam. 28.—Wood. G. C. t. 57. f2 1.—Ch. 
Sf. 187.—W. t. 5. f. 40.—C. Pecrinarum. Lin. 1124.—D. 
p. 129.—Kn. 5. t. 26. f. 2.—H. t. 296. f. 4. Somewhat 
heart-shaped, gibbous, rounded ovate, with longitudinal strize 

1 Compare with this the PecriniroRME (VW. ¢. 5. fi 37.) of 
Born. t. 3. f. 10.—(D. p. 156.) 
