52 



Valvala Paludina. 



1003 1 tricarinata Lesueur. 



V. carinata Sow. 



Faludina liam. 



(Bithinia Prideaux.) 



1004 2 tentaculata L. 



P. impura Lain. 

 (Viviparus Mtf.) 



1005 4 Listeri Forb. 



N. vivipara Miill. 



V. lacustris Bk» 1847. 



1006 2 vivipara L. 



N. fasciata xMiill. 

 P. achatina Drp. 

 V. Linnsei Bk. 1847. 



1007 4 dissimilis Mttll. 



P. carinata Sw. 

 unicolor Olivier 

 Swainsoni n. 



P. unicolor Sw. 

 angularis Miill. Ch. 



— var. (3. c. op.) 

 sp. 



carinata Val. 

 P. Burroughiana Lea. 

 4* decisa Say. 

 1 subcarinata Say. 



Bul. carinatus Brug. 



Paludoinus ISwis. 



1016 1 chilinoides Keeve. 

 M. ceylanica Fer! 



Am. bor. 



Dania. 



Germania. 



Ind. or. 



Africa. 

 China. 



Manila. 

 Am. bor. 



Ceylon. 



