CARDIUM. I [9 



wanting on the upper part towards the hinge ; the colour is 

 yellowish white, and the inside white, with an orange band 

 extending about half way from the hinge to the margin. 



unedo. 19. Shell somewhat heart-shaped, angu- 

 lated, and prominent at the anterior end ; 

 ribs armed with scattered elevated crescent- 

 shaped coloured striae. 

 Cardium Unedo. Linnaeus Syst. Nat. p. 1123. Chemnitz, 

 vi. p. 174. t. 16*. f. 168 and ]69. Schroeter Einl. iii. 

 p. 40. Gmelin,p. 3250. Bruguiere Enc. Meth. p. 214. 

 Wood's Conch, p. 242. t. 58. f. 3. Brooks's Introd. p. 

 161. t. 2. f. 19- 

 Bonanni Rec. 3. f. 375. Lister Conch, t. 135. f. 151. 

 Rumphius, t. 44. f. F. Petiver Amb. t. 18. f. 1Q. Gual- 

 ter, t. 83. f. A. Knorr, ii. t. 29. f. 2. Regenfuss, i. 

 t. 3. f. 25. Seba, iii. t. 86. f. 12. Da Costa Elements, 

 t. 6. f. 8. Enc. Meth. 295. f. 4. 

 Inhabits the East Indies. Lister. Coasts of Amboyna. Rum- 

 phius. Jamaica. D'Amlat China. Humphreys. 

 The length is most commonly an inch and three quarters, the 

 breadth near an inch and a half, and the height an inch and 

 a quarter ; it is very nearly allied to C. Fragum, but differs 

 in the dimensions, in having its crescent-shaped striae always 

 red, and the marginal teeth of the opposite valves at the an- 

 terior end locking much closer into each other. Born appears 

 to have confounded C. ringens with this species. 



ringens. 20. Shell roundish, longitudinally ribbed, 

 with the anterior margin deeply serrated and 

 gaping. 



Cardium ringens. Chemnitz, vi. p. 176. t. 16. f. 170. Gme- 



lin, p. 3254. Bruguiere Enc. Meth. p. 225. Wood's 



Conch, p. 219. 

 Cardium dentex. Solander's MSS. Portland Cat. p. 89. 



lot 1961. 

 Cardium, No. 5. Schroeter Einl. iii. p. 54. 

 Lister Conch, p. 330. f. 167. Knorr, iv. t. 14. f.3. and vi. 



t. 3. f. 4. Adanson, t. 18. f. 1. Favanne, t. 52. f. F. 



Enc. Meth. t. 296. f. 3. 

 Inhabits the coasts of Guinea. Petiver. Mouths of the Niger. 

 Adanson. Coasts of Africa, and the West India Islands. 

 Chemnitz. 

 The length and breadth are about an inch each, and the height 



