HELIX. 67 



Var. I. subrufa. Reddish brown, solid, with a strong 

 labial rib. 



Var. II. albida. Thin, white, 



Var. III. conica. Smaller, spire raised. 



Var. IV. nana. Much smaller, depressed, with a 

 strong labial rib. 



Var. V. subglobosa. More globular, thinner, light 

 coloured, umbilicus small. 



12. H. SERICEA (silky). 



Sub-globular, thin, rather glossy, very pale grey, some- 

 times tinged with yellow; thickly covered with white 

 silky hairs ; whorls six, tumid ; spire raised, obtuse ; suture 

 rather deep ; mouth semi- lunar, with white internal rib ; 

 umbilicus very small. 



This species is local, but abundant where it 

 occurs. It is found in Scotland, Yorkshire, Anglesea, 

 Hants, &c. 



Its chief distinction from H. hispida is its umbilicus, 

 which is very small, while that of the last species is 

 broad and deep ; besides which, the form of H. sericea 

 is more globular, the spire more raised, and the bristles 

 much thicker. The usual colour of H. hispida is much 

 darker, though the Var. subglobosa is much like H. 

 sericea both in shape and colour. 



Var. cornea. Horn-colour, very thin, labial rib 

 strong. 



