212 



(genus xil 



, CHAMA: 



SHELL BIVALVE, RATHER COARSE; HINGE WITH A 

 CALLOUS RIDGE OBLIQUELY INSERTED INTO A 

 CORRESPONDING FOSSULE; ANTERIOR SLOPE CLOS- 

 ED. 



Subdivisions.^ 



* Shells detached. 

 * # Shells adhering to other substances. 



cor. 1. Shell somewhat heart-shaped, globose, 

 smooth, with the umbones prominent, and 

 the apices spirally recurved. 



Chama Cor. Linnaus Syst. Nat. p. 1137. Born Mas. 



p. 80. Chemnitz, vii. p. 101. t. 48. f. 483. Schroeter 



Einl. iii. p. 228. Gmelin, p. 3299- Montagu Test. p. 



134, and Supp. p. 50. Shaw Nat. Misc. xv. t. 636. 



Donovan, iv. t. 1 34. Maton and Racket, in Lin. Trans. 



viii. p. 91. Brooks's Introd. p. 70. t. 3. f. 33. 

 Cardium humanum. Linnaus Syst. Nat. edit. 10. p. 682. 

 Cardita Cor. Bruguiere Enc. Meth. p. 403. 

 Isocardia globosa. Lamarck Syst. des Anim. p. 118. 

 Bonanni Rec. 2. f. 88, and Kirch, f. 92. Lister Conch, t 



275. f. 11. Rumphius, t.48. f. 10. Petiver Amb. t. 22. 



t Gmeiin's C. arata, p. 3304, and C. Thaca, p. 3305, are obscure species: 

 and I have therefore omitted them. 



