Our British Snails 39 



colour. Epidermis raised into lamellae or ridges 

 in the line of growth. Mainly northern. Fre- 

 quents dead leaves, especially beech and holly. 



H. (Acanthinula) aculeata. — More common than 

 the former ; which it resembles in habitat. 

 Differs chiefly by the ridges being produced into 

 spines. 



H. {Vallonia) ptdchella. — Tiny. White. Mouth 

 trumpet-shaped. Umbilicus wide. Under stones 

 and at the roots of grass. Its variety costata 

 (which some make a separate species) is strongly 

 ribbed. 



H. (Helicigona) lapicida. — Circular, flattened, 

 dark brown, strong white reflected rim to mouth. 

 Large umbilicus. Marked keel, which distin- 

 guishes it from all other British land shells. 

 Chiefly on chalk soils. Often on beech tree 

 trunks. 



H. (Gonostoma) ohvohita. — Common abroad, but 

 confined in England to a few spots in Sussex and 

 Hants. Circular, flat above, mouth triangular, 

 with a strong pinkish-white rim with three 

 denticles. 



H. {Pomatia) pomatia. — Described earlier. 

 Found in Hants, Sussex, Kent, Surrey, Oxford, 

 Gloucester, and Bedfordshire ; but very local. 

 Elsewhere it may well be an escape from captivity, 

 or the remains of an attempt (always unsuccessful) 

 to establish a colony. Boxhill and Caterham 

 are two good localities for Londoners. In Kent 



