140 Beautiful Shells. 
up shop till the return of solar heat. When in 
motion it carries its shell balanced obliquely on its 
back, and keeps advancing and retracting its ten- 
tacles. It is quite as destructive to vegetation as 
the slug. 
We should have enough to do to describe all 
the species and varieties, for of Helices alone we 

o-6, Vitrina pellucida (the Transparent Glass Bubble Shell), 
Miller. 7-8. Zonites cellarius (the Cellar Snail), <bid. 
9-10. Z. alliarius (the Garlic Snail), dbid. 11-12. Z. 
nitidulus (the Dull Snail), Draparnaud. 13-14. Z. purus 
(the Delicate Snail), Alder. 
may count at least forty. The Vitrina pellucida, 
or transparent glassy snail (Figs. 5 and 6), found 
among the putrescent leaves, moss, and decaying 
wood of plantations and hedge-bottoms, and also 
under stones, is an exceedingly thin, transparent, 
olossy, smooth, and fragile watery-green shell, 
through which the mantle of the animal within is 
reflected. It is elliptical in form, with three and a 
