114 THE SCOTTISH NATURALIST 



L. palustris and as numerous." This is repeated by Mr 

 F. G. Binnie {Fauna and Flora of the West of Scotland, 1876, 

 p. 41) with the suggestion of its having been " introduced (?)." 

 It is also repeated in Dr F. Buchanan White's Scottish list 

 of 1874 {Scot. Nat., Jan. 1874, ii., 208), and by myself in 

 1 89 1 (Census of Scottish Land and Freshwater Mollusca, 

 Proc. Roy. Phys. Soc. Edin., 1890, pub. 1891, x., 493). The 

 species was authenticated by examples collected in 1887 

 by Dr Thomas Scott. In 1906 Dr Frew wrote us that 

 it was introduced into the loch, and that he had seen it 

 in Mr Dougall's collection. He added that at the time of 

 his writing it was extinct there, and that the loch would 

 soon be drained as it had come into the hands of the 

 Glasgow Corporation for reclamation and cultivation. 



As to the statement that it is " ? introduced " to the 

 Frankfield Loch Station, I take it that it is not so much a 

 statement of fact as an opinion of Mr Binnie's and I much 

 demur to it, inasmuch as this paper shows a solid area of 

 distribution which suggests the likelihood of the station 

 being a natural one. If it be a fact and not an opinion we 

 ought to have it placed definitely on record by whom and 

 when it was introduced. 



I am indebted to Mr Alexander Ross for notes on the 

 loch from his own observations. It is situated about 4 

 miles N.E. from the centre of Glasgow, and close to the 

 main road to Stirling. It is slightly over a quarter of a 

 mile long at the longest part and almost the same at its 

 broadest, a peninsula projecting into it from the north 

 lessens its breadth by about half and makes it roughly 

 horse-shoe shape. From its western side a narrow ditch 

 connects it with Hogganfield Loch, situated less than half 

 a mile to the S.W. Its depth varies from the shallow 

 margin to about 6 feet in the middle, but is mostly not more 

 than 2 or 3 feet in dry weather, when a large extent shows 

 no sign of water. 



During the winter rains the whole area is flooded almost 

 to the main roadside, but in summer the water drains off 

 to Hogganfield, leaving perhaps about half round the sides 

 dry-looking. This is, however, deceptive, as a walk over 



