INTRODUCTION. 37 



ties, South Wales, and the Isle of Man ; and its most 

 northern limit is Iona, one of the western isles of 

 Scotland, where it has been found with H. virgata 

 by Mr. Lowe. 



Helix Pisana is found with the last, but is still 

 more local, having only been procured at St. Ives in 

 Cornwall, Tenby in South Wales, and in Ireland. 

 This is most probably the northern limit of this shell, 

 which is not found in Germany or Sweden. 



Clausilia biplicata is equally a southern species ; it 

 is very common in several places near London, and 

 Miller says its found near Bristol. 



Clausilia Rolphii is confined, as far as I have heard, 

 to its original habitat in Charlton wood, near London, 

 and to the neighbourhood of Hastings, Sussex. 



Succinea oblonga. This species has only been recorded 

 as a native of South Wales and North Devon, but it 

 has probably a larger range; I think it is indi- 

 cated as a variety inhabiting Berwick, by Dr. Johnston, 

 and it has lately been found at Glasgow and Preston. 



Pupa juniperi has always been believed to be 

 confined to the south-western part of the kingdom ; 

 but Mr. Laskey mentions it as occurring in Scotland. 

 This requires verification. 



Vertigo palustris^ and V. angustior, have only been 

 yet recorded as found near London and in the west 

 of England ; but they are probably common. 



The zoologists of the north of England have described 

 eight species which have not yet been discovered in the 

 southern portion of the kingdom ; some of which are 

 probably peculiar to that district. 



1. Limax brunneus, noticed by Dr. Johnston at 

 Berwick, and Mr. Alder at Newcastle. 



