VALVATA. PALUDINA. A7 
LES PERISTOMIENS. 
VALVATA. FLUVIATILE. 
Discoid or conoid; whorls cylindrical, umbilicated ; 
margins united and acute; operculum orbi- 
cular. 
V. PiscINALIS. Globular-conoid, somewhat 
trochus-shaped, deeply umbilicated ; apex obtuse,- 
longitudinally wrinkled, covered with a greenish 
yellow epidermis. B. 7. T. 114. 
V.sprrorsBis. Slightly concave above, and 
umbilicated, so as to expose the interior volutions 
beneath; horn-colour, striate transversely, three 
volutions. 75. B. T. 115. 
PALUDINA. FLUVIATILE. 
Conoid; volutions rounded or conver; aperture 
sub-rotund, ovate or oblong, angulated above ; 
margins of inner and outer lips united, with 
edges acute, but not reflected ; operculum horny, 
orbicular. 
P. vivipaRA. Thin, oval, acute; whorls five, 
much inflated, olive, with three brown bands ; 
sutures deeply impressed, finely striate longi- 
tudinally ; aperture pear-shaped, a little produced 
at the upper angle ; inner lip a little reflected, so 
as to close the umbilicus. lj. B. T. 118. 
P. acHaTina. Thin, conic-oval, acute; 
