156 LAND AND FRESH-WATER MOLLUSKS. 
it is, however, found in Algeria, and in the neigh- 
bourhood of Oporto, in Portugal. 
The shell is sub-cylindrical, shining, and vary- 
ing in colour from pale greyish- to a deep reddish- 
brown, or rarely white ;:the whorls are six; the 
aperture is triangular, and rounded below, with 
five folds; the margin of the aperture and the 
folds are generally of the colour of the shell, 
but sometimes white. 
It frequents dead leaves and moss in moist 
woods, and generally in company with Jlelix 
lamellata, with which it is also associated in a 
fossil state, in the newer Pleiocene deposits of 
Copford, in Essex. The Rev. J. Dalton ob- 
serves, that ‘I have been told that this species 
never ascends trees, but I took no less than 
fifty-three specimens in one day from the trunk 
of a young ash-tree, covered with woodbine, in 
Hackfall, Ripon. This was after long-continued 
rain. In dry weather it is very seldom found ; 
and until the above-mentioned day I believed it 
to be a very rare species.” 
Mr. J. G. Jeffreys writes of the habits of this 
snail, that ‘this is a shy little creature, although 
tolerably active when inclined to make its ap- 
pearance. It has a singular habit of withdrawing 
slowly one of its eyes, which rolls backwards 
like a little ball until it reaches the neck, while 
the tentacle which supports it remains extended 
