58 HELICIDJE. 



from Manchester, on the borders of Cheshire, both it 

 and its variety are not uncommon under stones, and 

 along canal banks among the roots of grass in the same 

 neighbourhood. 



Var. vitrina. Transparent, greenish white. 



9. Z. CRTSTALLINUS (crystalline). 



Depressed above, more convex below, thin transparent 

 pearly white ; whorls five, compressed ; mouth semi-lnnar ; 

 umbilicus exceedingly small ; diameter one-eighth of an inch. 



The iridescent appearance and symmetrical form 

 of this little shell cause us to regret that it is one of 

 the smaller instead of the larger members of the genus. 



It is easily identified from its colour and the com- 

 pressed appearance of the whorls, but especially by its 

 umbilicus, which is so small that a pin of moderate 

 size will hardly enter. 



It is common everywhere in moist sheltered situa- 

 tions. 



Var. complanata. Nearly flat on both sides, the 

 last whorl larger. 



10. Z. FTJLVUS (tawny). 



Pyramidal, thin, glossy, of a clear semi-transparent 

 horn-colour ; whorls five and a half, cylindrical ; mouth 

 narrow ; umbilicus merely a slight indent, only found on 

 adult specimens ; diameter one- tenth of an inch. 



