97 



Vmbones turning from the left to the right. 



Chama lazarus Chama florida 



damsecornis Hmbula 



gryphoides aeruginosa 



crenulata asperella 



unicornis decussata. 



Umbones turning from the right to the left. 



Chama arcinella Chama albida 



radians ruderalis 



cristella croceata 



Chama Japonica 

 [There are also eight fossil species.] 



ETHER1A. 



Sowerbys Genera, No. 1, pi. 1. 



This shell has never before been described by any 

 author on Conchology, and probably has escaped the 

 naturalist's researches, from its inhabiting the sea at a 

 great depth, where it is attached to the rocks by the 

 lower valve. In consequence of the irregularity of the 

 shape, its general appearance is that of an oyster ; it how- 



H 



