LIMNMA GLABRA AS A SCOTTISH MOLLUSC 119 



in pools in marshy places, associated with Sphagnum moss, 

 water-grasses, Potamogeton, Rushes, Sedges, etc. In the 

 north of England it occurs in similar habitats and also 

 in grassy blind-end ditches that is in shallow waters with 

 grassy margins and water-plants. 



Investigation should be directed to similar habitats in 

 Perthshire Mid, Fife, Haddingtonshire, Peeblesshire, Selkirk- 

 shire, Dumfriesshire, Roxburghshire, and Berwickshire, as well 

 as the English vice-county Cheviotland {i.e., Northumberland 

 North), in order to round off what is evidently the range 

 of the species. Possibly also it may occur further north. 



Another feature of interest for investigation is that 

 of association of species together in the same pond. In 

 various localities in England this species is found associated 

 with Planorbis spirorbis and Aplexa kypnorum, although this 

 particular association has not so far been observed in any of 

 the Scottish localities. It would be well if special attention 

 be paid to this point, bearing in mind that Aplexa hypnorum 

 should be looked for in the spring of the year, before 

 it dies out. 



As I am keenly interested in working out not merely the 

 northern limits of the areas of the various Scottish mollusca 

 but also their detailed occurrences throughout the whole of 

 their range, I trust further to enlist the assistance not only 

 of conchologists but of all naturalists who will collect and 

 send me what they are able to find. I wish to emphasise 

 most forcibly the necessity of paying most attention to the 

 common species, which are the dominant and variable forms, 

 and as Scotland is for the most part very thinly populated 

 by resident naturalists, I venture to ask for the assistance 

 of others. Specimens may at any time accompanied by 

 full notes of locality, date, habitat, etc. be sent to me at 

 259 Hyde Park Road, Leeds. 



