rARYPHANTA. 225 



Genus ARIOPHANTA, Desruoulins. 



Edge of mantle enclosed, not produced into lobes. 



Shell sinistral, unibilicated, thin, diaphanous, last whorl 

 angulatcd or keeled ; aperture oblique, lunar ; peristome 

 simple, acute, the columellar margin reflexed. 



Ex. A. Ia3vipes, Midler, pi. 79, fig. G. Shell, A. laevipes, 

 fig. G, a. 



The mantle in this genus does not appear to be extended 

 beyond the shell, as in Nanina, and the shells are sinis- 

 trorsal, thin, and angulated at the periphery. The species 

 are found in Southern Asia, Malabar, Birmah, Bengal, and 

 the peninsula of Malacca. 



Species of Ariophanta. 



Himalajana, Lea. Rumphii, V. cle Busch. 



Janus, Chem. ryssolemnia, AlLers. 



laevipes, Mull. trifasciata, Chem. 

 retrorsa, Gould. 



Genus paryphanta, Albers. 



Shell widely umbilicated, depressed, covered with a thick, 

 shining epidermis involving the peristome ; spire flat, whorls 

 few, the last tumid, anteriorly deflexed, umbilicus perspec- 

 tive ; aperture oblique, lunately oval ; peristome simple, in- 

 flexed. 



Ex. P. Busbyi, Gray, pi. 80, fig. 1. 



The animal of this genus has not hitherto been examined, 

 but judging from the shell, it is probable that the mantle- 

 margin is extended and reflexed. P. Busbyi and P. Green- 



