CHAM A. 217 



gitudinal crenulated ribs, and the margin 

 plaited. 

 Chama trapezia. Linnaus Syst. Nat. p. 1138. Midler 

 Zool. Dan. Prod. p. 247. Schroeter Eini. iii. p. 236. 

 t. 8. f. 17. Gmelin, p. 3301. Chemnitz, xi. p. 240. t. 

 204. f. 2005 and 2006. 

 Cardita trapezia. Bruguiere Eric. Meth. p. 407. 

 "Venus cancellata. Gmelin, p. 3288. 

 Venus pectunculus. Solander's MSS. '? 

 Venus, No. 71. Schroeter Einl. in. p. 178. 

 Lister Conch, t. 344. f. 181. Enc. Meth. t. 234. f. 7. 

 Inhabits the coasts of Norway. Muller. 

 Shell about four lines long, and three broad, and the depth is 

 nearly equal to the breadth ; it has nineteen or twenty lon- 

 gitudinal transversely crenulated ribs, and the colour is red- 

 dish, sometimes faintly rayed with purple at the anterior 

 end. It resembles Cardium exiguum. 



semiorbiculata. 9. Shell kidney-shaped, com- 

 pressed, with decussated striae, and the mar- 

 gin serrated at the posterior end. 



Chama semiorbiculata. Linnaus Syst. Nat. p. 1138. Gme- 

 lin, p. 3301. 



Chama phrenetica. Born Mus. p. 83. Chemnitz, vii. p. 

 135. t. 50. f. 502 and 503. 



Chama cordata Var. Gmelin, p. 3301. 



Chama, No. 2. Schroeter Einl. iii. p. 249- 



Hippopodus semiorbiculatus. Meuschen Mus. Gevers. p. 

 429. No. 1537. 



Cardita semiorbiculata. Bruguiere Enc. Meth. p. 410. 



Valentyn. Abh. t. 16. f. 27- Knorr, ii. t. 23. f. 7- Enc. 

 Meth. t. 233. f. 4. 

 Inhabits the coasts of Arabia. Humphreys. 

 Shell about three inches long, and two inches broad, of a 



uniform reddish brown colour, except on the posterior slope, 



which is whitish, and about half of the inside is also white. 



calyculata. 10. Shell oblong, longitudinally rib- 

 bed, and armed with vaulted scales ; posterior 

 slope gibbous ; margin plaited. 



Chama calyculata. Linnaus Syst. Nat. p. 1 138. Born 

 Mus. p. 82. t. 5. f. 10 and 11. Chemnitz, vii. p. 133. 

 t. 50. f. 500 and 501. Schroeter Einl. iii. p. 238. Gme- 

 lin, p. 3301. 



