HELlCIDiE. 213 



110. ; Pfeiffer, 60. t. 3. £ 25. ; Rossm. Icon. i. 76. 



t. 2. f. 29. 

 Clausilia lamellate. Leach, Mollusc, p. 118. 

 Helix Cochlodina derugata. Fer. Tab. 63. 

 Clausilia laminata. Turton, Man. ed. 1. 70. f. 53. 

 Bulimus bidens. Brug. E. M. 352. 



In beech woods, among decayed leaves, and on the 

 bark of trees, especially in a chalky soil. 



Animal pale fulvous ; upper tentacles long, clavate. 

 (Sturm, Fauna, t. .) 



Shell half an inch long, of a glossy reddish horn- 

 colour and nearly smooth ; spire composed of twelve 

 raised volutions ; aperture roundish-oval with a white 

 thick margin, attached at the upper part of the body 

 volution, with two laminar folds, one of them straight 

 and placed near the top of the aperture and almost 

 central, the other curved and in the middle of the 

 pillar lip, frequently crenate; and deep within the 

 mouth are three or four permanent ridges which are 

 visible on the back at the outside when held before a 

 strong light. 



Varies greatly in size, ventricoseness, and colour, 

 being sometimes greenish white and transparent. 



Montagu (Test. Brit. 359.) considered the white 

 variety as a shell deprived of its brown epidermis, 

 but the periostraca is as distinct on the greenish white 

 shell as on the brown specimen ; both the shell and the 

 periostraca are differently or rather uncoloured in that 

 variety, from the absence of the colouring matter. 



Dr. Turton, by an oversight, first describes the 

 operculum as emarginate, and then makes his third 

 variety to be characterised by the internal lamina 

 being notched. 



