72 The Shell-Collector’s Handbook. 
grey; mantle bilobed, one lobe of which is split into six, 
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/ 
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Fie. 2. Physa Fontinalis. 
the other into nine digitate processes which, when expanded, 
lap over the shell. 
Alaintat.—Running brooks, canals, ditches, and sluggish 
* rivers. 
v. inflata (Moq.); Shell larger, more ventricose. 
v. curta (Jeff.): Spire extremely short. (=Bulla 
Jluviatis, Turt. Conch. Dict., p. 27.) 
v. oblonga (Jeff.): Spire considerably produced. 
v. albina (Jeff.): Shell milk-white in colour. 
m. dextrorsum (Williams): Spire dextral. 
PHYSA ACUTA, DRAP. 
SHELL of an elongated-ovoid shape, ventricose, somewhat 
glossy, with very fine longitudinal striz, light horny, or 
whitish in colour; whorls three to five, alittle convex, the last 
forming three-fifths of the total height of the shell; sutures 
moderately deep; apex acuminate; aperture obliquely 
Fia. 3.—Physa Acuta. 
and narrowly oval, acute superiorily; peristome interrupted, 
with the rudiment of an interior thickening. Alt.8-16 mm. ; 
diam. 7-9 mm. Animal deep brown, covered with blackish 
spots. 
Habitat.—In one of the lily tanks in Kew Gardens. 
Imported. 
