PHYSA. 
225 
membrane is such that I have failed in ascertaining 
either the form of the central tooth, or the curve of 
the horizontal row. 
101 . 1. Physa fontinalis. Stream Bubble Shell.— 
Shell horn-colour, oval, with a very short 
obtuse spire; aperture dilated at the base. 
(t. 9. 1 . 11. f. no.) 
Bulla fontinalis. Linn. Trans, viii. 126. t. 4. f. 1. (not de- 
scription) ; Linn. S. N. 1185.; Mont. p. 226. — Buli- 
nus perla. O, F. Muller ^ Naturforscher., xv. 6. t. 1. — 
Pianorbis bulla. Muller Verm. ii. 167. — Bulimus fontinalis. 
Bimg. Fncy. Mkh. 306. — Bulla fluviatilis. Turton, Conch. 
Diet. 27. — Helix bullseoides. Donovan^ B. S. t. 168. f. 2.??; 
Linn. Trans, viii. p. 126. t. 4. f. 1. — Physa fontinalis. Drap, 
Hist. p. 54. t. 3. f. 8, 9. ; Brard., p. 167. t. 7. f. 7, 8. ; La- 
march., vi. ii. 156. ; Leach., Syn. Moll. 100. ; Jeffreys, Linn. 
Trans, xvi. 379.; Turton, Man. ed, 1. 127. f. 110.; Forbes 
and Hanley, B. M. iv. 140. t. 122. f. 8, 9. — ^ Limnea fonti- 
nalis. Gray, in Sowerby, Gen. f. 8. — Turbo adversus. Da 
Costa, B. C. 96. t. 5. f, 6. — Physa (Bulinus) fontinalis. 
Moq. Tand, Moll. F. ii. 451. t. 32. f. 9 — 13. 
Yar. 1., spire longer (t. 11. f. 110*.); Forbes and Hanley, B. M. 
iv. 140. t. 122. f. 10: Physa acuta? J. Sowerby (not 
Drap.'). 
Var. 2., last whorl rather angular behind: Physa alba. Jenyns, 
MSS. (not Turton). 
In rivers and streams, on aquatic plants. 
Animal blackish grey ; tentacles paler ; the jaw 
triangular, lower edge arched, crenulated (fig. 55.) ; 
Fig. 55. 
The upper J aws of Physa acuta magnified. 
The narrow non-striated part is implanted in the 
flesh. 
teeth lanceolate ; strongly toothed on each side. See 
Otto GoldfusSy 48. t. 6. f. m., and Weigman^ Arch. 
Q 
