LIAINMA GLABRA AS A SCOTTISH MOLLUSC 113 



LIMN^EA GLABRA AS A SCOTTISH MOLLUSC. 

 By W. Denison Roebuck, M.Sc, F.L.S. 



The recent discovery by Mr George Nelson in Stirlingshire 

 of this sparingly distributed mollusc is of great interest, 

 suggesting the desirability of summarising all that is known 

 of its Scottish range, especially as regards ascertaining 

 its northern limit in Britain, the nature of its habitats, and 

 of its faunal and floral companions in them an ecological 

 study of some importance. 



In the British Islands the Conchological Society's Census 

 of Distribution shows that it has been seen and authenticated 

 by the Society's referees from ten vice-counties in the south 

 of England, five in the east, six in the west and in Wales, 

 ten in the north of England, and five in the south-east 

 of Scotland. 



In the north of England it is on record for numerous 

 and widespread localities in all the five vice-counties of 

 Yorkshire, in Durham, Northumberland South, Westmor- 

 land, and Cumberland one solid block of area. Then in 

 Scotland we have it in the six vice-counties of Lanarkshire, 

 Edinburghshire, Linlithgowshire, Stirlingshire, Perthshire 

 South, and Perthshire North, which but for its non-record 

 for Fife and Perthshire Mid would constitute another solid 

 area of range. Between these two areas intervene Cheviot- 

 land and half a dozen lowland Scottish counties, the absence 

 of the species from these being, I may venture to suggest, 

 more apparent than real, by reason of the great paucity 

 of resident observers. 



I will recapitulate in full detail the occurrences so far 

 known to me from Scotland. In doing this I am much 

 indebted to my friends Mr William Evans, F.R.S.E., Mr 

 Henry Coates, F.R.S.E., Mr Alexander Ross, and Mr George 

 Nelson for valuable and full notes. 



V.C. 77. Lanarkshire. Mr John Dougall in his Glasgow 

 and ten-mile list of 1869 {Trans. Glasg. Nat. Hist. Soc, i., 

 193) recorded it as in " Frankfield Loch, mingled with 

 77 p 



