HELICID^. 215 



opinion that they were distinct : the British shell is 

 more slender and spindle-shaped than the French; 

 they are, perhaps, only local varieties ; but it is 

 extremely difficult to define the species of this 

 genus. 



This species was first described as British by Mon- 



80.< 3. Clausilia Rolphii. Rolph's Close Shell, 

 (t. 5. f. 54.) Shell ventricose, thin, opake, red- 

 brown, with regular crowded raised striae ; aper- 

 ture with four or five plaits, two of which are 

 longer. 



Clausilia Iphigenia Rolphii. Gray, Med. Repos. 

 1821. 182. 



Clausilia Rolphii. Leach, MSS. ; Gray, Ann. Phil. 

 15.; Ferussac, Journ. Phys. 1820. 301.; Leach, 

 Mollusc, ined. p. 119.; Alder, May. Zool. and 

 Bot. ii. 111.; Turton, Man. ed. 1.71. f. 54. 



Clausilia plicatula. Drap. p. 74. t. 4. f. 17, 

 18.?; Brard, p. 85. t. 3. f. 10.?; Jeffreys, 

 Linn. Trans, xvi. 353. ; Rossm. Icon. p. 39. t. 2. 

 f. 32. 



In damp places in woods, among the moss and 

 stones, under nettles and dogs' mercury, and on 

 trunks of trees, on a chalky soil. 



Animal grey. 



Shell an inch long, of a greyish brown horn-colour, 

 tumid in the middle ; spire composed of ten or eleven 

 rather swollen volutions, which are marked with re- 

 gular raised longitudinal lines; aperture roundish- 

 oval, sinuous at the upper and outer angle; the 

 margin thick, white, detached all round, with four or 



