PALUDINA. 



OBSERVATIONS. 



This genus may be distinguished from Melania by the 

 construction of the operculum, which has no other than 

 concentric Hnes of growth, whilst that of Melania has the 

 lines of accretion spirally radiate. 



The name of the genus was adopted by Lamarck from 

 Bruguiere, but Montfort applied to it the name of Vivi- 

 parus, which is retained by Blainville in his plate, though 

 in the text he adopts that of Paludina. 



PLATE XXX. 



PALUDINA POiNDEROSA. 



SPECIFIC CHARACTER, 



Shell thick ; labrum more prominent towards the base. 



SYNONYM, 

 PALUDINA PONDEROSA. Nob, JoUV. Acud. Nttt, Sc VoL 



ii,p. 173. 



