PALUDINA. 31 



Montagu, T. B. 386. — Paludina crystallina, Grmj, Med. 

 Rep. 1821, p. 239. — Paludina Listeri. Forbes u?td Ha?dei/, 

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

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

 dina contecla. Moq. Tand. Moll. F. n. 512. t. 40. f. 1. 24. — 

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

 Natica vivipara. Fernssui. — Cyclostoma contectum. Mdl. 

 Moll. Maine and Loir. 5. 1813. — Nerita fasciata Midler 

 Verm. ii. 182. part. — Nerita vivipara. 3fiUler, ii. 182. — 

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

 vivipara. Lam. vi. 173. ; Ndson, 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. Olio. Ad. 178. — Helix fasciata. Gmelin, S JV. 

 364. b. — Helix ventricosa. Olive, Zadoral, 17 8. — Paludina vul- 



