ZONITES. 247 



with the edge of their aperture sharp and not reflected. 

 The character of tlie teeth in the animal is also found to re- 

 semble that in Vitrina more than Helix. 



The species are — Z. cellarhis: white, with the head and 

 neck violet ; the shell about half an inch wide ; pale amber ; 

 flat, with smooth, rounded whorls. Z. alliaritis, with the 

 shell much smaller and more convex. Z. nitidultis: larger, 

 pale yellow above, opaque-white beneath, with large umbili- 

 cus. Z. purus: animal white, with two black lines; shell 

 very small, depressed, white, smooth, and transparent. Z. 

 oiitidiis: dark, with a transparent, glossy, minute shell. Z. 

 radiatulus: black, with a depressed, shining, transparent 

 shell, regularly ribbed. Z. e.vcavatus is like it, but the shell 

 not so much depressed ; and Z. cri/stallina is very minute, 

 white, with a flat, shining, smooth, transparent, greenish- 

 white shell. 



The most minute, and at first sight insignificant, of these 

 various creeping things are endowed with beauties of de- 

 tail which well repay attentive examination; and, while a 

 thoughtless person would pass by a whole drawerful of their 

 tiny shells, as containing a " parcel of snails, all alike,^^ a 

 more attentive observer would find something peculiar and 

 interesting in each. 



