GENUS XII. CHAM A. 71 



and inserted, and one distant lateral tooth under the carti- 

 lage (see Chama Cor, f. 34). 

 Chama. Shell adhering-, inequivalved ; the beaks unequal ; 

 the hinge with one thick oblique tooth ; two muscular 

 impressions in each valve (see Chama Lazarus, f. 35). 



Perhaps we may place here the genus Diceras (see Park. 

 Organ. Rem. vol. 3. p. 205), described as follows: 

 Diceras. A ventricose, transversely subrugose bivalve; the 

 beaks distant, shaped like horns, and contorted in irregu- 

 lar spires. 



