ON THE GEOGRAPHICAL DISTRIBUTION OF 

 MOLLUSCA IN SOUTH LONSDALE. 



Rev. C. E. Y. KENDALL, B.A., J. DAVY DEAN, and 

 W. ^lUNN RANKIN, ^LSc., B.Sc. 



{Contimied from page j8i). 



Clausilia hidentata parvida Turton. Associated species 



Vitrina pelliicida 

 Vitrea liicida Drap. 

 ,, cell aria Miill, 



Pyramidiila rotundata Miill. 

 Helix hortensis ^NIull. 

 Pupa cylindracea da Costa. 

 Cochlicopa lubrica i\Iull. 



Hygromia hispida L. 

 Pupa cylindracea da Costa. 

 Cochlicopa lubrica Miill. 



alliaria Miller. 

 pur a Alder. 



This form differs from the true hidentata in habit and in 

 nature of habitat, and may well prove to be like C. rolphii 

 almost subterranean. It is found with the Vitrecs under the 

 loose mossy stones in the dry upper wood. 



Limax cinereo-niger Wolf. Associated with : — 



Agriolimax agrestis L. 

 Arion hortensis Fer. 

 Vitrea alliaria Miller. 

 Pyramidida rotundata Miill. 



The above is a sub-association connecting with the one just 



given, and is characteristic for the loose stones lying among 



the dry carpet of ' Yew-needles ' and Holly leaves, as distinct 



from the luxuriant moss-growth under the Ash. 



Siih-section — Hazel and Ash Copse. 



Dominant — Pomatias elegans Miiller. Associated species : — 



Vitrina pellucida Miill. Helix hortensis Miill. 



Vitrea cellaria Miill. Hygromia rufescens Penn, 



,, nitidula Drap. Ena ohscura Mull. 



This species, restricted in Britain to the Calcareous soils of 



England and Wales, reaches at Meathop one of the most 



northerly stations. As in the case of Clausilia parvula (Turton), 



the period of hibernation is an extended one, usually from 



Mid-October to the first week in May. Its habitat is described 



by Reeve as being chiefly in the vicinity of water, not in wet 



places, but at the roots of shrubs near the sea coast. At Arn- 



side and Silverdale, it is abundant on the Hazel-covered slopes 



which face the shore, but it is equally abundant in the Hazel 



and Ash copses near Haweswater. We hav^e also taken this 



species in abundance on the chalk in Sussex, where it occurred 



on a dry bank sheltered by a Hazel copse. 



Limestone Pavements. 



Dominant : — Helix nemoralis L. Associated species : — 



igog Dec. i. 



