38 



Var. I. acuta. Smaller, more oblong, mouth nar- 

 rower. 



Var. II. albida. Smaller, thinner, and white. 



5. L. STAGNALIS (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. J rag His. Smaller, more slender. 



Var. II. albida. Shaped like Var. I., but white in 

 colour. 



Var. III. labiata. Dwarfed, solid, outer lip re- 

 flected and thickened. 



6. L. PALUSTRIS (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 



