ZONITES. 57 



be taken not to confound it with the young of Z. 

 nitidus. 



Var. viridescenti-alba. Greenish white. 



7. Z. NITIDUS (glossy). 



Rather solid, glossy, and semi-transparent, chocolate 

 brown, transversely striated, faintly granulated under a 

 microscope ; wliorls five ; spire raised, apex blunt ; suture 

 deep ; mouth round ; umbilicus narrow, but deep ; diameter 

 a quarter of an inch. 



It is found at the roots of grass in moist places, not 

 very abundantly. Its most distinctive characteristic 

 is the absence of white on the under side. 



Var. albida. White. 



8. Z. EXCAVATUS (hollowed out). 



Not very glossy, semi-transparent, light brown, coarsely 

 striated; whorls five and a half, nearly cylindrical; spire 

 rather prominent ; suture very deep ; mouth nearly circular ; 

 umbilicus very broad and deep ; diameter nearly a quarter 

 of an inch. 



This is a well-marked species. Its broad and deep 

 umbilicus, its convex spire, cylindrical whorls, and 

 coarse appearance combine to render it easy of identi- 

 fication. The young shells are slightly carinated. 



It is found in various parts of England, Scotland, 

 Ireland, and Wales, but it is a local shell. Not far 



