560 



VERTIGO ALPESTRIS (Alder): 



Its Distribution in North Lancashire and Westmorland, and its 



Association with Vertigo pusilla Miiller. 



By J. DAVY DEAN and The Rev. C. E. V. KENDALL, B.A. 

 Supplementary Note. 



(v/We anlea pp. 2og-2ii ), 

 Plaie \\. 



Since the publication of our article last summer we have been 

 able to extend somewhat our knowledge of the distribution of these 

 two species, and in this we have been greatly aided by Mr. F. H. 

 Sikes, M.A., of Rochester, and late of Windermere, to whom our 

 best thanks are due, as he has given us up-to-date information about 

 several localities from which the species had not been recorded 

 for some time. 



We therefore submit a Supplementary List of new or newly-verified 

 localities, along with a map, which we hope clearly shows the 

 frequency with which these species occur in the district we have 

 been working. We now find that the distinction 'always on a 

 limestone soil ' is as a rule only applicable to F. pusilla habitats, 

 and, from the nature of many of the more northern localities, we 

 believe that the distribution of V. alpestris is more relative to a 

 woodland type than to a calcareous soil. 

 In Westmorland (V.C. 69 J : — 



Grasmere - - confirmed by F. H. Sikes, 1908. 



Ambleside to Rydal ,, „ 



Windermere - „ „ „ 



Crook - - F. H. Sikes, 1 908. 



Troutbeck Bridge - ,, ,, 



Kendal - - confirmed by ^V. Gyngell, 1908. 



Underbarrow ^ 



Crosthwaite j r- u ^.r t- o 



-,,, . , . r J.D.D. and C.E.Y.K., 1908. 



Whitebeck " 



Meathop - j 



In Furness (V.C. 69) : — 



Sawrey (on ^Vindermete) confirmed by F. H. Sikes, 1908. 



