LAND SNAILS. 14] 
this snail occurs in great plenty on the trunks of 
beech trees having a southern aspect. 
Hutrx opvotutra—(the Cheese Snail) (Pl. VIL, 
fig. 49)—the aperture of the shell of this species 
is rather curious, and alone is sufficient to distin- 
suish it; it is obliquely triangular, with a tooth- 
like protuberance. The shell is nearly circular, 
flatabove, with the spire slightly sunk, compressed 
below, and with a large umbilicus; the whorls, 
six in number, are closely wrapped together, cylin- 
drical, compressed from side to side, and gradually 
increasing in size ; the last one is dilated towards 
the mouth. Young shells want the triangular 
mouth and reflected lip. 
The colour of the shell is reddish, with the 
epidermis raised into curved ridges, and clothed 
with short stiff brown hairs. The dental for- 
7 1G) 
The principal locality for this shell.is Ditcham 
Wood, near Buriton, Hampshire; it is also found 
at Uppark and Stoner Hill, in the same county. 
In Ditcham Wood it occurs abundantly, and 
hybernates at the base of hazel trees; the 
epiphragm is thick and of a chalky-white colour. 
Huiix ERiceroruM—(the Heath Snail) (Pl. 
VIIL., fig. 68).—The shell of this species 1s very 
elegant, of a circular flattened form, with an ex- 
ceedingly large umbilicus and a nearly circular 
mouth. These characters will enable one readily 
