VALVATA. 27 
Var. III. ovata. Four whorls, shorter, more tumid. 
Var. IV. elongata. Sometimes eight whorls, 
Var. V. pellucida. White, transparent. 
Family III—VALVATID&. 
Genus.— V ALVATA. 
1. V. piscinALis (inhabiting fish ponds). 
Somewhat globular, rather solid, nearly opaque, brownish 
yellow ; whorls six, very convex; spire blunt; sutwre very 
deep ; mouth circular ; wmbilicus deep. 
Found in lakes, canals, and rivers throughout the 
British Isles. 
Var. I. depressa. Flatter, umbilicus larger. 
Var. II. subcylindrica. Spire more raised. 
Var. III. acuminata. More raised and pointed. 
2. V. cristata (crested, 2.e. with branchial plume). 
In shape a circular coil, glossy, light horn-colour, 
rather solid; whorls five; mouth circular; umbilicus very 
large and open. 
This species frequents canals, lakes, ponds, &c. 
It may generally be found at the roots of weeds in 
muddy ponds. 
