110 CARDIUM. 



Shell about three or four inches long, and three and a half or 

 four and a half inches broad, and the depth of each valve is 

 nearly half the breadth ; young shells are brittle and trans- 

 parent, but become thicker and more opake with age ; 

 there are about eighteen high sharp edged ribs extending 

 along the outer surface, and the inside has corresponding 

 grooves ; the colour is pale tawny, and the ribs white. 



lima. 2. Shell heart-shaped, with longitudinal ribs, 

 edged with elevated dots on one side, and 

 lamellated on the other. 



Cardium Lima. Gmelin, p. 3253. Wood's Conch, p. 230. 

 Cardium Asiaticum. Bruguiere Enc. Meth. p. 224. 

 Cardium costatum India? orientalis. Chemnitz, vi. p. 160. 



t. 15. f. 153 and 154. 

 Cardium, No. 3. Schroeter Einl. iii. p. 52. 

 Enc. Method, t. 292. f. 1. a. b. 



Inhabits the Asiatic Ocean, and principally the coasts of Tran- 

 quebar. Bruguiere. 



The length is about an inch and three-quarters, the breadth 

 about two inches, and the height is nearly equal to the 

 length ; the shell has from thirty to forty longitudinal ribs, 

 edged with short spines on the posterior, and with recurved 

 membranes on the anterior side ; the inner surface has hol- 

 low grooves corresponding with the external ribs, and in 

 these are projecting points, with which those on the outside 

 appear to be connected ; the margins are toothed and pointed 

 like a saw, and on the posterior side under the umbones is a 

 heart-shaped depression ; the colour is yellowish white, and 

 reddish on the inside towards the margin ; it is a very rare 

 shell. 



cardissa. 3. Shell heart-shaped ; valves com- 

 pressed, keeled, and the keel toothed ; inn- 

 bones approximated. 



Cardium Cardissa. Linnceus Syst. Nat. p. 1121. Chemnitz, 



vi. p. 150. t. 14. f. 143 and 144. Schroeter Einl. iii. p. 



29- Barbut Verm. p. 28. t. 3. f. 8. Gmelin, p. 3245. 



Bruguiere Enc. Method, p. 208. Wood's Conch, p. 59- 



f. 1 and 2. 

 Cardium Cardissa. Var. £. Born. Museum, p. 41. t. 2. f. 



17 and 18. 

 Lister Conch, t. 318. f. 155. Rumphius, t. 43. f. E. Gual- 



ter, t. 84. f. B, C, and D. Argenville, t. 23. f. I. F«- 



vanne, t. 51. f. E. 2. Enc. Method, t. 293. f. 3. 



