244 
LIMNJEAD^. 
Planorbis nitidus. Muller^ Verm, iL 263. (part) ; Flemings 
B. 278. ; Jeffreys^ Linn, Trans, xvi. 389. ; Alder^ Mag. 
Z. and B. ii. 114. ; Forbes and Hanley, B. M. iv. 161. t. 127. 
f. 11, 12. — Helix fontana. Light/. Phil. Trans. Ixxvi. 
(1786), t. 2. f. 1.; Montagu., p. 462. t. 6. f. 6. — Planorbis 
complanatus. Drap. p. 47. t. 2. f. 20 — 22. ; Rossm. Leon. ii. 
16. t. 7. f. 116. ; Brard, p. 161. t. 6. f. 4. — Planorbis lenti- 
cularis. Kickx, Moll. Brah. 67. ; V. Alien ; Sturm., Fauna., 
vi. 8. 16. — Planorbis fontanus. Flem. Ed. Ency. Vii. 
Turton., Man. ed. 1. 110. f. 93.; Moq. Tand. M. F. ii. 426. 
t. 30. f. 10 — 17. — Plelix lenticularis. V. Alien., 35. t. 2. 
f. 4. — Planorbis (Hippeutis) lenticularis. Hartm. in Sturm., 
Fauna., t. 16. — Segmentina? fontana. Beck., Syn. Ind. 
123. 
In clear stagnant waters^ on aquatic plants. 
Animal black. 
Shell not a quarter of an inch in diameter, of a 
Fig^ 58. (Jark or whitish horn-colour, very convex 
d beneath, with the centre flattened, above 
flat, with a central umbilicus ; the outer volution 
slightly but rather sharply carinate near the middle ; 
the front of the shell is regularly convex, has the 
appearance of being the proper spire, as in Seg- 
mentina. This shell differs greatly in size and 
colour; the larger specimens are generally much 
the darkest, being often reddish-brown. 
e. Spire deeply umhilicated ; whorls rounded before 
and behind^ not heeled^ close pressed. (Bathyom- 
phalus.) 
112. 10. Planoebis. Twisted Coll Shell. 
— Shell deeply umbilicate above, nearly flat 
beneath ; whorls eight, convex ; suture deep ; 
aperture very narrow, crescent-shaped, (t. 8. 
f. 96.) 
Helix contorta. Linn. S. N. i. 1244. ; Montagu., p. 457. t. 25. 
