62 The Shell-C ollector’s Handbook. 
umbilicus small, oblique; operculum nearly circular, 
flattish,and with the nucleus central. Length of shell 
+ inch; width 2 lines. Animal whitish, with black and 
yellow spots visible through the shell. 
Habitat.—Ditches, canals, and sluggish rivers. 
v. elongata (Jeff:): Shell smaller; spire more pro- 
duced. (B.C., vol. i., p. 62). 
v. albida (Rimmer): Shell white. 
