338 



VIVIPARIDiE. 



vaceous epidermis ; peristome thin, continuous, simple 



anteriorly. 



Syn. Viviparus, Montf. Paludina, Lam. Cyclo- 

 stoma, Oken, not Lam. Pleurocera, Blainv. Viviparella, 

 Omphemis, Oxytrema, Rajifi. Henterum, Huhn. 



Ex. V. fasciata, Milller, pi. 36, fig. 1. Operculum, 

 V. fasciata, fig. 1, a, 1, h. Shell, V. fasciata, fig. 1, c. 



The ViviparcB inhabit the rivers and lakes throughout 

 the northern Hemisphere. The females are ovo-vivipa- 

 rous, and the young fry are not forsaken by their parent 

 until the end of the second month of their existence, by 

 which time the bands of cilia, which ornament their shells, 

 have disappeared. 



Species of Vivipara. 



angularis, Mull. 

 angulata, Lea. 

 atra, Villa. 

 Bengalensis, Lam. 

 bicarinata, Desm. 

 Boissieri, Cliarp. 

 Coosaensis, Lea. 

 costata, Quoy. 

 crassa, Nutt. 

 cyclostomatiformis, Lea. 

 dissimilis, Mull. 

 doliaris, Gould. 

 elongata, Swains. 

 fasciata, Miill. 

 gigantea, V. d. Busch. 

 Haleiana, Lea. 

 Hamiltoni, Metcalfe. 



inflata, Bens. 

 iutertexta, Say. 

 Javanica, V. d. Busch. 

 lacustris, Beck. 

 lecythoides, Bejis. 

 melanostoma, Bens. 

 nucleus, Thomp. 

 pyramidata, V. d. Busch. 

 quadrata, Bens. 

 Remossii, Bens. 

 subpurpurea. Say. 

 Swainsonii, March. 

 tricarinata, Anton. 

 Troostiana, Lea. 

 unicolor, Oliv. 

 Warrenii, Shuttl. 



