133 



XXV. PALUDINA. 



Shell conoid or oblong, covered with an epidermis : 

 aperture roundish-oval, slightly angular at top, 

 united all round : operculum roundish, with se- 

 veral nearly circular concentric striae. 



118. Paludina vivipara. Shell thin, oval, acute ; 

 volutions five, much inflated ; with three brown 

 bands : the sutures deeply impressed. 



Paludina vivipara. Brard, p. 174. t. 7.f. 1. 

 Cyclostoma viviparum. Drap. j). 34. ^. 1./. IG, 17. 

 Viviparus Fluviorum. De Montfort, ii. p. 247. 

 Helix vivipara. Linn. Mont. p. 386. 



Shell an inch and a quarter long, and an inch broad, 

 thin, transparent, finely striate longitudinally, of an 

 olive colour with three brown bands on the larger 

 volution : spire composed of five inflated and 

 deeply divided volutions, the first very large, the 

 terminal one a mere point : aperture pear-shaped, 

 a little produced at the upper angle ; the inner 

 lip a little reflected so as to half close the um- 

 bilicus. 



In still waters and slow rivers. 



