38 LIMN ZIDZ. 
Var. I. acuta. Smaller, more oblong, mouth nar- 
rower. 
Var. II. albida. Smaller, thinner, and white. 
5. L. staGnauis (inhabiting swamps). 
Elongated, rather thick, not very glossy, pale whitish 
horn-colour, striated in line of growth; whorls six to eight, 
body whorl forming most of the shell; spire tapering ; 
mouth large. 
This is the largest member of the genus. It is 
generally distributed throughout the British Isles, 
inhabiting slow streams, canals, and standing water. 
This species also is often much improved by a careful 
brushing. 
Var. I. fragilis. Smaller, more slender. 
Var. II. albida. Shaped like Var. L., but white in 
colour. 
Var. III. labiata. Dwarfed, solid, outer lip re- 
flected and thickened. | 
6. L. paLtstris (inhabiting marshes). 
Tapering, rather solid, dull brown; whorls six to seven, 
tumid; mouth pear-shaped. 
This shell is found in ponds and slow running water 
throughout the British Isles. It is exceedingly variable 
