PALUDINIDJE. 91 



Viviparus fluviorum. De Montf. ii. 247. 



Paludina achatina. Sow. Gen. f. 1. 



Cyclostoma contectum. Millet, Milf. 5. 



In still waters and slow rivers. 



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 last very large, the first 

 a mere point; aperture pear-shaped, a little pro- 

 duced at the upper angle ; the inner lip a little re- 

 flected so as to half close the umbilicus. The young 

 shells are subglobose, pellucid, obscurely banded, rather 

 flattened above, and furnished with five ciliated lines. 



4.2. PALUDINA achatina. Common Marsh Shell, 

 (t. 8. f. 119.) Shell rather thin, conic-oval, 

 acute; volutions six, rather tumid, with three 

 olive-brown bands ; the sutures well defined. 



Helix vivipara. Linn. S. N. part. 



ventricosa. Oliv. Ad. 178. 



Paludina vulgaris. Gray, Med. Rep. 1821, p. 239. 



fasciata. Desk., Lam. vii. 513. 



Lymnea vivipara. Flem. 



Nerita fasciata. Muller, Verm. 182. 



Cyclostoma achatinum. Drap. 36. 1. 1. f. 18. 



Turbo achatinus. Sheppard, Linn. Trans, xiv. 125. 

 t. 1. f. 18. 



Paludina achatina. Brug. E. M. t. 458. f. 1.; Lam. 

 H. vii. 174.; Rossm. 109. f. 66*.; Turton, Man. 

 133. f. 119. 



Helix vivipara b. Gmelin, S. N. 36. 46. 



Nerita fasciata. Sturm, Faun. vi. 2. t. 12. 



