hand-slugs and Glass-shells 341 



Tlie shell is rather convex above, less so beneath, 

 (lark liorn coloured, tliin, and exceedino'ly glossy, 

 clouded with white round the narrow but deep 

 umbilicus. It inhabits woods and helds, but though 

 widely distributed it is quite local. The Smooth 

 Glass-snail {H. nitidida), though about the same 

 size or slightly larger than the last, is less trans- 

 parent, and more like the Cellar Snail, but the spire 

 is more raised than in that species, the surface less 

 glossy, the mouth less oblique, and the umbilicus is 

 larger and deeper. It is found under stones, dead 

 leaves and moss, in woods and hedge banks, where it 

 frequently buries itself. The Rayed Glass-snail 

 {H. radiatula) is equally convex above and below, 

 dark brown, thin, very glossy, marked across the 

 whorls by well-defined lines, which give the rayed 

 appearance. The umbilicus is small, but tolerably 

 deep. The shell only measures about one-seventh of 

 an inch across, and may be sought in similar but 

 moister situations than those given for H. nitidula. 



The Clear Glass-snail {H. 2nira) is like H. vifididff, 

 but differs in being much smaller (one-third inch 

 across) and tlie um.bilicus much narrower. It is 

 widely distributed, but somewhat local. It keeps 

 almost entirely buried under dead leaves and moss 

 in woods. The Shining Snail (H. nitida) somewhat 

 resembles H. radiatida, but is larger (one-quarter 

 inch), has a more prominent spire, and the rays are 

 much less distinct. It is also less convex below than 

 above, and is not so thin. It is found at the roots 

 of grass, under stones and among moss in damp 

 places. The Hollowed Glass-snail (H. excavatuf^) 

 is so-called on account of its wide and deep umbilicus. 



