CLAUSILIA, 107 
the columellar folds; outer lip inflected ; basal crest short and curved ; 
unebilicus indistinct; clazseléum oblong, regularly curved, slightly 
contracted above. A. 12mm. B. 34mm. 
This is a rare and local species, though sometimes 
plentiful where it occurs, found only in a few localities 
in some of the southern counties of England, also in 
Notts. and Northants; not for Wales, Scotland or Ireland. 
It is found chiefly under stones and has the peculiarity 
of being almost subterranean in its habits. 
Dr. Jeffreys says: ‘From C. rugosa and its variety dubia 
this differs in being more ventricose and of a lighter 
colour, as well as in having much coarser strize, which im- 
part to the last-mentioned shell a decussated or slightly 
granular appearance. The mouth of the shell in C. vo/phi 
is, besides, larger and broader.” 
Var. pellucida (Taylor). Colourless and transparent. 
Sub-genus—A.LiInDA HY. & A. Adamis. 
3. C. BIPLICATA (having 2 folds) Montagu. PI. V., f. 4. 
Fusiform, dull, iridescent ; rufous brown streaked with white ; 
strongly striate; whorls 12-133; mowth oval, angular, contracted 
below, where a narrow but deep channel is formed ; Zee¢h as in 
C. rolphii; umbilicus broader than usual in the genus; clausideum 
almost oval, slightly curved. A. 16; mm. B. 44 mm. 
This is one of our very local shells. It is found at the 
roots and on the bark of willows by the Thames at 
Putney and Hammersmith, in fair abundance ; and also 
