CH. VIl] SNAILS AND SLUGS 2-il 



oval, outer lip generally thick and without a rib, sometimes 

 reflected and toothed. Most species to be found in woods, 

 hedges, gardens, etc., especially in moister parts. 



(1) without umbilicus, i.e. concealed. 

 nemoralis L., 1", lips brown, common everywhere. 



aspersa Miill., If", lips white, whorls 4^ ; spiral bands generally 

 confluent, crossed by transverse patches. Not common in 

 limestone districts. 



hortensis Miill., 1", lips white, whorls 5^, spiral bands distinct 

 and not crossed by transverse patches. 



(2) with umbilicus. 

 (a) with labial rib. 



* pisana Mull., f ", shell without keel, striped and mottled ; um- 



bilicus small and oblique. 

 (Hygromia Kisso.) rufescens (Penn), |", shell bluntly keeled ; 



reddish-brown, frequently with white band on last whorl. 

 hispida (L.), ^", shell not keeled, not striped, may be devoid of 



labial rib. 



granulata (Alder), J", shell not keeled, not striped, greyish- 

 white, downy and granulated ; umbilicus very small. 

 (Helicella Fer.) virgata (Da Costa), J", shell without keel, striped 

 but not mottled ; umbilicus narrow and deep. Dry downs 

 with short turf. 



cantiana (Mont.), ", shell without keel, unstriped, tinged with 

 rose, umbilicus narrow and deep. 



* cartusiana (Mull.), ", shell without keel, unstriped, horn colour, 



umbilicus minute. 

 caper uta (Mont.), J", shell keeled and striped with coloured 



bands. Dry downs with short turf. 

 (6) without labial rib. 



* Helix pomatia L., If", shell globose, striated, pale yellow with 



broad light brown bands. 



(Helicigona (Fer.) Risso.) arbustorum (L.), ", shell globose, 

 striated, brown with blackish band along the middle of 

 each whorl. 



lapicida (L.), ", shell depressed, rufous brown, aperture oval, 

 angulated, umbilicus large. Dry downs with short turf. 



* Occur only in southern and western counties. 

 L. 16 



