LAND AND FRESHWATER MOLLUSCA OF SCOTLAND 149 



ADDITIONS TO THE AUTHENTICATED COMITAL 

 CENSUS OF THE LAND AND FRESHWATER 

 MOLLUSCA OF SCOTLAND. 



WM. DENISON ROEBUCK, F.L.S. 



Late Hon. Secretary and Recorder to the Conchological Society of 

 Great Britain and Ireland. 



I HAVE again to bring forward a considerable number of 

 additional and other records, in continuation of my papers 

 in previous numbers of the " Annals of Scottish Natural 

 History," the last instalment of which appeared in the 

 number for July 1 894. For the materials from which the 

 notes now brought forward are written I am again indebted 

 to old friends and former contributors in Mr. William 

 Evans, F.R.S.E., to whom I am in particular indebted for 

 the great and abiding interest he takes in these papers of 

 mine, Mr. Andrew M'Clellan of Stirling, Mr. Thomas Scott, 

 F.L.S., of Leith, and Mr. Alex. Shaw of Glasgow ; and I 

 have also the pleasure of including material from two new 

 investigators in Mr. G. M'Dougall of Stirling and Mr. G. A. 

 Frank Knight of Glasgow. To all these gentlemen I have 

 to tender my best thanks for their cordial appreciation of 

 the value of the " authentication " principle an appreciation 

 to which some of my friends, never having heard of the life's 

 work of Mr. Hewett Cottrell Watson in botanical topography, 

 have never been able to attain. The paragraphs are num- 

 bered in continuation of my previous papers. 



43. MOLLUSCA FROM SOUTH PERTH WITH CLACKMANNAN VICE- 

 COUNTY. We are indebted to Mr. G. M'Dougall of Stirling for a 

 number of shells collected by him in the neighbourhood of Bridge 

 of Allan, Blairlogie, and Abbey Craig, including a few from the 

 Lake of Menteith ; all these localities being within vice-county 

 No. 87, which includes South Perthshire, lying south of the water- 

 shed line between the basins of the Forth and the Tay, in addi- 

 tion to Clackmannanshire and outlying and detached portions of 

 Stirlingshire. The species sent were as follows, those marked with 

 the asterisk (*) being additions to the authenticated list : *Sucdnea 

 elegans (see also paragraph 44), Vitrina pelhta'da, Hyalinia cdlaria, 

 H. alliaria, H. nitidttla, If. pura, H. radiatula, If. crystallina, H. 



