PALUDINA. 
31 
Montagu^ 2". 386. — Paludina crystallina. Gray^ Med. 
Rep. 1821, p. 239. — Paludina Lister!. Forbes and Hanley., 
B. M. ill. 8. t. 71. f. 16. — Cyclostoma achatinum. Drap. Moll. 
36. t. 1. f. 18. — Paludina acb.atina. Sow. Gen. f. 2. — Palu- 
dina con tecta. Moq. Tand. Moll. F. 11. 512. t. 40. f. 1. 24. — 
Vivipara communis. Dupuy^ Moll. Franc. 537. t. 27. f. 5. — 
Natica vivipara. Ferussui. — Cyclostoma con tectum. Mill. 
Moll. Maine and Loir. 5. 1813. — Nerita fasciata. Muller 
Verm. 11. 182. part. — Nerita vivipara. Milller^ 11. 182. — 
Cyclostoma viviparum. Drap. 34. 1. 1. f. 16, 17. — Paludina 
vivipara. Lam. vi. 173. ; Nihon., 88. ; Turton, Man. ed. 1. 
133. f. 118.; Brard., 174. t. 7. f. 1.; Rossm. f. 66.; Desk. 
viii. 511. — Vivlparus tluviorum. De Montf. 11. 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.u. 529. S. N. part. 1247. — He- 
lix ventrlcosa. Oliv. Ad. 178. — Helix fasciata. Gmelin. S N. 
364. — Helix ventricosa. Olive., Zadoral.\7 — Paludina vul- 
