294 Roebuck : MolLuscan Fauna of Langstrothdale. 



found in Raysgill in August 1890, by the Rev. Trevor Basil 

 Woodd, B.A., to whom the Union was much indebted for 

 various information. 



The total number of species included in this list is 47, only 

 seven of these being- freshwater species, 10 slugs, and 30 land 

 shells. 



The most striking feature of the moUuscan fauna of the 

 dale, as shown by the present list, is its northern or subalpine 

 facies, shown not only by the presence of northern types as 

 Clausilia cravenensis and Acanihijiula lamellata, which the close 



Clausilia cravenensis : the Original Locality, Wall in Starbotton Village. 



approach of the //eli'x arbustorum to the alpine form, known as 

 the variety <7//'^^/;'/.y, still further emphasises; but the elevated 

 and remote character of the district is further accentuated by 

 the dwarfed growth of Vitrea crystdllina, Pupa cylindracea, 

 Cochlicopa lubrica, and other species which normally inhabit the 

 milder climate of lower altitudes, and there attain a noticeably 

 larger size. 



About Buckden, in fact, we find a meeting-place or outpost 

 of the retreating or subalpine fauna and the advancing and 

 more dominant species, which latter, however, in their stunted 



Naturalist, 



