196 BRITISH MOLLUSKS. 



Helix fasciata, G-melin (1788), Syst. Nat. p. 3646. 



Helix ventricosa, Olivi (1792), Zool. Adriat. p. 178. 



Helix compactilis, Pulteney (1799), Cat. Shells, Dorset, p. 48. 



Bulimus viviparus, Poiret (1801), Coq. deVAisne, p. 61. 



Cyclostoma achati/n/wm, Draparnaud (1801), Tail. Moll. p. 40. 



Viviparus fluviorum, De Montford (1810), Conch. Syst. vol. ii. p. 247. 



Paludina achatina, Studer (1820), Kurz. Verz. p. 91. 



Paludina vulgaris, Gray (1821), Lond. Med. JRepos. vol. xv. p. 239. 



Turbo achatinus, Skeppard (1823), Trans. Linn. Soe. vol. xiv. p. 152. 



Paludina vivipara, Say (1830), Amer. Conch, pi. x. 



Paludina fasciata, Deskayes (1838), Lam. Anim. sans vert. vol. viii. p. 512. 



Vivipara fasciata, Dupuy (1851), Hist. Moll. vol. v. p. 540. pi. xxvii. f. 6. 



Hao. Europe, ckiefly in central parts, England, ckiefly midland and 



soutkern counties. Not in Scotland, Ireland, or United States. (In 



canals, ponds, and gently running waters.) 



The shell of this species has a more constricted closely coiled 

 growth than that of the preceding, the whorls do not bulge out into 

 an angular shelf as in P. contecta, and the apex is more obtuse. 

 Its range of habitation is the same both in England and the Conti- 

 nent, and it appears, lighter and more inflated in growth, in North 

 America, chiefly in the States of Georgia and Indiana. Mr. Jeffreys 

 has remarked that the animal of P. vivipara is of a darker colour 

 than that of P. contecta. The tentacles are bluish-black with 

 bright yellow spots, the difference of their size in the male being 

 very perceptible. 



Valvata cristata. (Much enlarged.) 



Genus III. VALVATA, Miiller. 



Animal ; oblong, carrying a light heliciform or discoid shell, head pro- 

 duced into a ringed proboscis, tentacles cylindrical, moderate, ap- 

 proximating at the base, with the eyes on inner tubercular swell- 



