ZONITES. 55 



is seen to be more interrupted by the penultimate 

 whorl. 



(7.) It has less white below, and is altogether slightly 

 more smooth and transparent. 



In shape it more nearly resembles Z. alliarius, but 

 its size is sufficient to prevent its being mistaken for 

 that species. 



Mr. Rogers tells nie that when the animal is within 

 the shell it may easily be recognized by the abrupt 

 termination of the colour of the mantle, which is dis- 

 tinctly visible through the transparent shell. 



4. Z. NITIDULUS (slightly glossy). 



Compressed, thin, only slightly- glossy, whitish under- 

 neath ; whorls five, convex ; spire slightly raised ; suture 

 rather deep ; mouth round, except where interrupted by the 

 last whorl ; umbilicus very broad and deep ; diameter be- 

 tween a quarter and three-eighths of an inch. 



This shell is widely distributed, and, like the rest of 

 the genus, frequents moist places under stones and in 

 woods. 



It may be distinguished from Z. cellarius by its 

 smaller size and its much larger umbilicus. It has, 

 moreover, one whorl less, and is not nearly so glossy. 



Yar. I. nitens. Smaller and lighter, last whorl very 

 large. 



