84 The Shell-Collector’s Handbook. 
pressed at the sides; mouth ovate, sub-oblong, mem- 
branous. Length of shell 4 in.; breadth 75 inch. Animal 
greenish-yellow, spotted with black; eyes sessile, round, 
black ; tentacles cylindrical, obtuse and white. 
Habitat,—Lakes, ponds, and sluggish streams, attached 
to water-plants, and the dead leaves of trees which have 
lain some time in the water. 
v. Moquiniana (Bourg.): Shell elevated, very convex 
anteriorily, convex laterally and posteriorily; apex more 
crooked, slightly obtuse; aperture elliptical, narrow. 
(=Ancylus Moquinianus, Bourg., in Journ. de Conch., 1653, 
mlo7, pl. vi., fig. 9.) 
v. compressa (Jeff.): Shell rather larger, and consider- 
ably broader and flatter than usual (B. C., vol. 1., p. 122). 
v. albida (Jeff.) ; Shell milk-white, with a light-grey 
epidermis (B. C., vol. i, p. 122). 
