PALUDINA. 31 



Montagu, T. B. 386. Paludina crystallina. Gray, Med. 

 Rep. 1821, p. 239. Paludina Listeri. Forbes and Hanley, 

 B. M. iii.8. t. 71. f. 16. Cyclostoma acliatinum. Drap. Moll. 

 36. t. 1. f. 18. Paludina achatina. Sow. Gen. f. 2. Palu- 

 dina contecta. Moq. Tand. Moll. F. ii. 512. t. 40. f. 1. 24. 

 Vivipara communis. Dupuy, Moll. Franc. 537. t. 27. f. 5. 

 Natica vivipara. Ferussui. Cyclostoma contectum. Mill. 

 Moll. Maine and Loir. 5. 1813. Nerita fasciata. Miiller 

 Verm. ii. 182. part. Nerita vivipara. Mutter, ii. 182. 

 Cyclostoma viviparum. Drap. 34. 1. 1. f. 16, 17. Paludina 

 vivipara. Lam. vi. 173. ; Nilson, 88. ; Turton, Man. ed. 1. 

 133. f. 118.; Brard, 174. t. 7- f. 1.; Rossm. f. 66.; Desk. 

 viii. 511. Viviparus fluviorum. De Montf. ii. 247. 

 Paludina achatina. Sow. Gen. f. 1.; Leach, Syn. Moll. 

 208. 



In still waters and slow rivers far from the 

 sea. 



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, slightly 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. 



6. 2. PALUDINA vivipara. Common Marsh Shell. 

 Shell rather thin, conic-oval, acute ; volutions 

 six, rather tumid, with three olive-brown bands ; 

 the sutures well-defined, (t. 10. 119.) 



Helix vivipara. Linn. Faun. Gall.ii. 529. S. N. part. 1247. He- 

 lix ventricosa. Oliv. Ad. 178. Helix fasciata. Gmelin, S N. 

 364. b. Helix ventricosa. Olive, ZadoraL 178. Paludina vul- 



