EASTERNESS AND ITS MOLLUSCAN FAUNA 113 



ness, such as Limax niaximus, Hyali7iia nitidula, Punctum 

 pygmcBiim, Pyraniidula rotundata, Helicigona arbustormn, 

 Hygromia fiisca^ H. granidata^ Pupa cylindracea, SpJiyradhiin 

 edentiihini, Balea perversa, Clausilia bidentata, and Cary- 

 cJimin minivuivi, among the land shells. 



Only six freshwater molluscs have been reported, but 

 we ought certainly to see Unio viargaritifer (the Pearl 

 mussel), Aticyhis flnviatilis, LhmKBa truncatula, and other 

 Pisidia, besides other species. It would be of interest to 

 ascertain if such species as Helix iiemoralis, Helix aspej'sa 

 (so far only known to have crossed the line of the great 

 rift valley at one point, Ardtornish Castle on the Sound of 

 Mull, in Westerness), and Hygroinia hispida, have attained 

 so far north, these three being species whose northern limits 

 require tracing out. 



I wish to make a direct appeal for further research in 

 this vice-county. If any specimens exist in collections, 

 either public or private, we should like to see them. If any 

 residents in the vice-county will collect what specimens they 

 can, their assistance will be valued — and in doing so it is by no 

 means needful that they be conversant with our mollusca. 

 Any observant lover of nature, if he takes care to include 

 the small species, and the common and therefore dominant 

 and variable forms, can further the quest, and naturalists 

 and others visiting the area can render equally good service. 

 The slugs are particularly desired, as they must always be 

 seen in a living state. 



In the mountainous regions the observation of altitudinal 

 range is of importance and interest, and in all cases the 

 furnishing of as full data as possible, locality, habitat, 

 altitude, date, etc., adds immeasurably to the value of an 

 observation. 



I shall be glad to hear from any one willing to co- 

 operate, at 259 Hyde Park Road, Leeds. 



53 



