76 HELICIDA. 
land). The varieties are equally common with the 
type. 
Var. I. bizona. Two dark bands on the body whorl. 
Var. II. inflata. More tumid, shorter, streaked 
with brown, or marked with a single band. 
2. B. montanus (inhabiting mountains). 
Globosely conic, slightly glossy, light brown; whorls 
seven and a half; spire tapering, but blunt; lip white, re- 
flected ; wmbilicus narrow, but deep. Immature specimens 
are keeled. 
This is a local shell, being confined to the southern 
and western counties of England. It has a habit of 
ascending the ash and the beech in the spring, pre- 
sumably to feed and pair, descending in the autumn 
to hibernate. 
3. B. opsctrus (hidden). 
Of the same shape as the last species, but much smaller, 
rather shorter in proportion, and more glossy ; transparent 
horn-colour; whorls six and a half. 
The name odscurus was given to this shell in con- 
sequence of its habit of covering itself, by means of its 
slime or an exudation of the epidermis, with earth or 
any substance it comes in contact with,—thus rendering 
itself inconspicuous. In some districts, where the ex- 
