CURRENT LITERATURE 71 



Crossbills feeding on Rowans. We have for two mornings, 

 17th and 1 8th October 191 7, seen Crossbills feeding on our rowan 

 berries. This morning there were three, a female and two young 

 birds among starlings, missel-thrushes, and other unbidden guests. 

 You will probably be aware of one of the irregular autumnal 

 visitations of this interesting bird. Does this imply severe 

 continental conditions ? Alex. Macdonald, Durris. 



Pisidium personatum, Malm, in Mid-Perth. When 

 examining, along with my son, some mosses collected by him on 

 the margin of a tarn at an altitude of about 3000 feet on Cru-y-Ben, 

 Tarmachans, near Killin, in July 1909, we found a dozen examples 

 of a species of Pisidium among the stems of Webera albicans var. 

 glacialis. A few months ago I sent these small bivalves to Mr 

 Roebuck in connection with the Conchological Society's authenti- 

 cation scheme. They have been examined by Messrs Charles 

 Oldham, R. A. Phillips, and A. W. Stelfox, who are in agreement 

 in regarding them as depauperate examples of P. personatum, Malm. 

 Previous Scottish localities for this species are given in Woodward's 

 Catalogue of British Pisidia in the collection of the British Museum, 

 published in 1913. William Evans, Edinburgh. 



CURRENT LITERATURE. 



Grey Seal in North Sea. A young example of this species 

 has been found on the east coast of England, and presented to 

 the Zoological Society of London. It is suggested that it may 

 have reached this unusual region from Shetland, since Grey Seals 

 seldom frequent the British coasts of the North Sea. Field, 

 January 1918, p. 70. 



Marine Animals and Coast Erosion. Prof. T. J. Jehu 

 discusses the work of rock-boring organisms and their ultimate 

 influence upon the wearing away of the coast-line, in Scot. Geog. 

 Mag., January 191 8. 



The Habitats of Freshwater Mollusca. An interesting 

 paper by A. E. Boycott discussing this subject, and showing to 

 what extent various types of habitation influence the molluscan 

 population in a limited area, appears in Journ. Conchologv, 

 January 1918. 



