278 THE SCOTTISH NATURALIST 



Hygrumia hispida, Dunottar Castle, no date. This to me looked 

 like a small form of H. rufescens, and as neither of these 

 species ranges in Scotland, north of Perthshire, and 

 Kincardineshire on the east, or Argyleshire on the west, it 

 would be well to have this record authenticated. 



Planorbis nitidus (fontanus), Loch of Strathbeg, no date. 



PI. contortus, Loch of Strathbeg and St Fergus Canal, etc., no date. 



Anodonta cygnea, var. anatina, Crimond, Strathbeg, no date. 



Limncea peregra, var. lacustris, Cruden. Is not that variety, but in 

 the cases there is a form like it without locality or date. 



Ltmncea palustris. Below Bridge of Dee, October 1843, Win. 

 Keith, and Strathbeg, 20th September 1843. 



Limnica truncatula, Hilton Quarries, Stuart Park, Marian Mac- 

 gillivray, 1841. 



Pupa muscoruin. No locality or date. 



P. cylindracea, Cruden, no date. There are in the cases other 

 species, which have mostly been contributed from Lngland 

 by a Mr Bell. 



REPORT ON THE INVESTIGATION OF LAND 

 MOLLUSCA IN THE NORTH OF SCOTLAND. 



By W. Denison Roebuck, F.L.S., and John W. Taylor. 



By the aid of a grant from the Government fund administered 

 by the Royal and other societies, supplemented from private 

 sources, an investigation of the Mollusca in certain areas in 

 the northern counties of Scotland was made by Mr Fred 

 Booth in 19 10. 



The object was to accumulate evidence with a view of 

 ascertaining how far north certain dominant and invading 

 species of land and to a lesser extent fresh-water Mollusca 

 have attained, and conversely the southern and eastern limits 

 of some of the older and more recessive species which are 

 being displaced. 



As one of us has stated in addresses delivered to the 

 International Entomological Congress at Oxford in 191 2, 

 and to other bodies, these problems of distribution are of the 



