440 Proceedings of the Boyal Physical Society. 



in Great Britain falls short of the northern kingdom, or which 

 in Scotland are confined to a few scattered stations, is 

 considerable. 



The total number of species — 103, excluding Neritina and 

 Paludina — here recorded for the whole of Scotland does no 

 more than reach the total of 103 recorded for an English 

 vice-county situate so far north as Mid- West Yorkshire, and 

 the total we give includes fourteen additions to the list 

 published in 1873 by Dr White,^ which is the only general 

 catalogue for Scotland of which we are at present aware. The 

 number he recorded was 93, to which we add two species of 

 Ario7i, one of Limax, one of Amalia, two of Testacella, two of 

 Zonites, one of Helix, two of Vertigo, and three of Pisidium. 



The distribution of fresh-water shells in Scotland is 

 apparently marked by considerable limitations of northward 

 range. There are not many of them that occur in more than 

 a few scattered stations in the highland counties, and these 

 mainly along the eastern coast, while the proportion of them 

 which reaches the northern coast-line is very small. 



The distribution of Scottish land shells is, on the contrary, 

 strikingly wide. There are only about three instances of 

 absolute restriction to or decided predilection for the western 

 side of the kingdom — {Helix rufescens^ H. ericetorum^ and 

 Bulimus acutus), and but one of apparent predilection for the 

 eastern coast in Bidimus ohscurus. Eestrictions of range 

 in the northward direction are likewise remarkably few, and 

 it is quite possible that they may be more apparent than real, 

 and arising from lack of information. It would be a matter 

 of considerable interest to ascertain in this respect whether 

 Helix nemoralis, H. concinna, and H. hispida find in reality 

 their northern limits in Westerness and Kincardineshire, as 

 would so far appear. 



I have now only to say that no attempt to deal with the 

 distribution of varietal forms has been made beyond carefully 

 recording under each species the varieties included in the 

 examples seen by our referees ; that it is very desirable that 

 records for such places as Perth, Aberdeen, Queensferry, 

 standing on the borders of counties or vice-counties, should 



1 Scottish Naturalist, Oct 1873, and Jan. 1874, pp. 163-169, and 205-209. 



