435 



ON THE GEOGRAPHICAL DISTRIBUTION OF 

 MOLLUSCA IN SOUTH LONSDALE. 



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

 W. MUNN RANKIN, M.Sc, B.Sc. 



{Contimied from page 381). 

 Clausilia hidentata parvula Turton. Associated species : — 



Vitrina pellucida Miill. Pyramidula rotundata Mull. 



Vitrea liicida Drap. Helix hovtensis Miill. 



,, ccllaria Miill. Pupa cylindracea da Costa. 



,, aUiaria Miller. Cochlicopa lubrica Miill. 



,, piira 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 Vitrece under the 

 loose mossy stones in the dry upper wood. 



Limax cinereo-niger Wolf. Associated with : — - 



Agriolimax agrestis L. 

 Arion hovtensis Fer. 

 Vitrea alliaria Miller. 

 Pyramidula rotundata Miill. 



Hygromia hispida L. 

 Pupa cylindracea da Costa. 

 Cochlicopa. lubrica Miill. 



Vitrina pellucida Miill. 

 Vitrea cellaria Miill. 

 „ nitidula Drap. 



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. 



Sub-section — Hazel and Ash Copse. 



Dominant — Pomatias elegans Miiher. Associated species : — 



Helix hovtensis Miill. 

 Hygromia rufescens Penn. 

 Ena ohscura Miill. 



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 have 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 : — 



1909 Dec. I. 



