VITRINA. 25 



and animal being like the former, but differing from it 

 in the position of the shell, which is placed on the 

 posterior part of the body and external. They are car- 

 nivorous, and live for the most part in holes under the 

 ground. 



Hob. The islands of Guernsey and the other Chan- 

 nel islands, and in or near nursery gardens in the south 

 and south-west of England. 



A spurious species, T. Maugii, has been introduced 

 by some conchologists, from having been found in a 

 nursery garden near Bristol, and at Devizes. 



HELICIDJE. 



VITRINA. Draparnaud. 



Shell Exceedingly thin, subglobular, with a depressed spire 



of a few whorls ; pellucid. 

 Animal Lanceolate ; mantle large, furnished with a lobe on 



the right side. 



V. PELLUCIDA. Mutter. PI. V, fig. 12. 



Shell small in proportion to the animal, very thin, diaphanous, 

 colour varying from a white or yellow tint, to that of a beautiful green 



Helix pellucida, Mull. H. elliptica, Brown. 



This beautiful little mollusk is a connecting link be- 

 tween the slugs and snails, having the shield-like mantle 

 of the one and the external globular shell of the other. 

 The animal also is only partly retractile. The shell is so 

 thin and brittle that a very slight crush would break it. 

 It is as its name implies vitreous, more so perhaps than 

 any other shell. 



Hob. Plentiful in all parts of the country among 

 moss, or buried a few inches under the surface of the 

 ground. May be found among decayed leaves and 

 peat, when not too moist, in great abundance. 



ZONITES. Gray. 

 Shell Spiral, more or less discoid ; spire of many whorls, 



depressed ; mouth nearly circular. 

 Animal Lanceolate, tentacles four, the posterior ones small ; 



mantle reflexed. 



