194 



or knobs ; the columella smooth and arched, the lower 

 part of their aperture entire, constantly wider than the 

 upper : they are also covered with a brown or black epi- 

 dermis. The animal breathes only air. 



I 



Melania asperata 



truncata 



coarctata 



Melania decollata 

 ••• — •• amarula 

 . . .... thiarella 



spinulosa 



granifera 



carinifera 



truncatula 



....... fasciolata. 





subulata 



laevigata 







1 



MELANOPSIS. 



MELANOPSIS COSTATA. 



Encycl. Meth. p. 458,/. 7. 



These shells are fluviatile, and are very nearly allied 

 to those of the preceding genus; from which, however, 

 they are easily distinguished by their columella being 

 callous at the upper part, and their base truncated as in 

 the Achatina. They approximate the G. Pirena, from 

 which they principally differ in having only one si- 

 nus,or a widened opening at the base of the shell. They 



