224 CHAMA. 



sinistrorsa. 24. Shell ear-shaped, thick, scaly, 

 with one or two longitudinal furrows ; margin 

 crenulated, and the summits reversed. 

 Chama siuistrorsa. Bruguiere Enc. Meth. p. 392. 

 Chama gryphoides, Var. Chemnitz, ix. part 1. p. 145. t. 



1 16. f. 992 and 993. Gmelin, p. 3303. 

 Favarme, t. 80. f. D. Enc. Method, t. 196. f. 3. 

 Inhabits the coasts of the West India Islands. Chemnitz. East 



Indies. Bruguiere. 

 Shell about two inches in diameter, thick, ponderous, of a 

 brownish colour, sometimes mottled with white, or marked 

 „ with two or three longitudinal darker bands ; the upper valve 

 has one or two broad longitudinal furrows, and the summits 

 are turned from the left to the right, contrary to the usual 

 direction. 



arcinella. 25. Shell somewhat heart-shaped, with 

 spinous longitudinal ribs, and excavated 

 dots; margin crenulated, and slightly plaited. 



Chama arcinella. Linnaus Syst. Nat. p. 1139. Born 

 Mus. p. 85. Chemnitz, vii. p. 156. t. 52. f. 522 and 523. 

 Schroeter EinL iii. p. 246. Gmelin, p. 3303. Bru~ 

 guiere Enc. Meth. p. 393. 

 Bonanni Rec. 3. f. 336, and Kirch. 2. f. 101. Lister 

 Conch, t. 355. f. 192. Petiver Gaz. t. 156. f. 23 ; and 

 Pterigraphia, t. 15. f. 389. Knorr, iv. 1. 14. f. 1 ; and 

 vi. t. 36. f. 1 and 2. D'Jvila, t. 17. f. T. Favanne, 

 t. 52. f. E. Enc. Method. 1. 197. f. 4. 

 Inhabits the coasts of Brazil. Bonanni. Bay of Campechy. 

 Petiver. East Indies. Knorr. Islands of St. Croix and St, 

 Thomas. Chemnitz. Naples. Ulysses. Martinique. Hum- 

 phreys. 

 Shell commonly about an inch and a half long, and near an 

 inch and three-quarters broad ; white, sometimes tinged with 

 rose colour, and the inside yellowish ; the posterior depres- 

 sion is large, excavated, cordiform, and warty, and terminates 

 at the lower margin in long spines; Bruguiere says, the 

 summits are reversed in the same maimer as those of C. si~ 

 nistrorsu. 



