TRIBE CARDIACEA. 133 



thirty-five depressed ribs, of which the first few anterior ones are 

 flat and imbricated, a few posterior ones flattened and without the 

 numerous scaly striae, which cross the central ribs, which have one 

 side rounded and are angular on the other. 4g. — S. Carolina. 



C. RuGosuM. Lam. 23.— C /. /. 32, 39, 4\.—Ch.f. 191. 

 —E. t. 297./. 2.—A71. C. Flavum? Lin.—W.t.b.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- . . 2\. — Ceylon, Java.^ 



C. Sulcatum. 24. — C. Serratum. Briuj. p. 229. — C. Ob- 

 LONGUM. D. p. 123.— CA. /. 190.— 7?. t. 298. /. 5.—W. t. 5. 

 f. 23. — C. Flavum. Bom. 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 depi'essed ; umbones obhquely in- 

 curved towards the posterior side, and the inner margin serrated. 

 3 . . 2^. — 3Ieiliterranean. 



C. Levigatum.* Pennant.— Lin. 1123?— D. p. 123.— 

 Wood. G. C. t. 54./. 1.— TF. t. .5./. 21.— Don. 2. t. 54.— 

 C. Serratum. Lam. 25.— List. t. 332. /. 169. Obhquely 

 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.. If. — England. 



C. Serratum.* Lin. 1123. — D. p. 124. — C. Levigatum. 

 Lam. 26.— Ch. f. \89.— Turt. Biv. t. 13. f. b.—Knorr. 2. 

 t. 20. f. 4. §• 5, t. 10./. 7.-C. Citrinum. Wood. G. C. t. 54. 

 /. 3. — W. t. 5. /. 22. Obovate, longer than broad, rather oblique, 

 convex, glossy, thin, pale yellow with the anterior slope chesnut, 

 with obsolete minute longitudinal striae, except at the sides, a pink 

 stain in front of the beaks : within stained with purplish rose near 

 the hinge, the margin finely serrated. IJ . . l^. — W. Indies, cj'c. 



C. Biradiatum. Brng. Diet. p. 231. no. 28. — Lam. 27. — 

 C. LiNEATUM. D. p. 123.— Ch. /. 185, 6.—E. t. 298. /. 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 . . Ih- — Ceyloii. 



C. iEoLicuM. Lam. 2S.— Wood. G. C. t. 57. /. \.—Ch. 

 f. 187.— TF. t. 5./ 40.— C. Pectinatum. Lin. 1124.— 1>. 

 V- 129.— Kn. 5. t. 26. /. 2.—E. t. 296. /. 4. Somewhat 

 heart-shaped, gibbous, rounded ovate, with longitudinal striae 



* Compare with this the Pectiniforme (IF. t. 5. /. 37.) of. 

 Born. t. 3./. 10.— (Z>. p. 156.) 



