The OliQOchgeta of the Forth Area. 113 



'.-I 



JSolosoma hemprichi, Ehrbg. 



JEolosoma ehrenbergii, Orst. 



This species, in which the prostomium is broader than the next segment, 

 and the oil globules are orange-coloured, seems to be common in stagnant 

 weedy pools. Murray detected it among duck-weed (Lemna minor) from 

 the Upper Elf Loch, Braid Hills, Nov. 1905, as recorded by me in Ann. 

 Scot. Nat. Hist, for 1906 (p. 57); and in Dec. 1905 I found several among 

 the same plant from a pond at Duntarvie near Winchburgh. In Feb. 1906 

 I again noted what was doubtless the same species among water ranunculus 

 from a pond at South Queensferry. 



Mr Murray reported an JEolosoma " with colourless spots " in material from 



a pool on Largo Links, Sept. 1906, but this character alone is insufficient for 



its identification. 



Fam. NAIDID.E. 



Chsetogaster diaphanus (Gruith.)? 



Beddard in his "Monograph of the Oligochaeta" 1895 (p. 306) refers 

 Dalyell's Nais lacustris 1 (renamed iV. scotica by Johnston 2 ), which was 

 doubtless from the Edinburgh district, to this species. 



When examining water-weeds and other material from ponds in our area, 



I have once or twice observed a small aquatic worm apparently belonging to 



this genus. 



Chsetogaster limnsei, K. Baer. 



Dr J. H. Ashworth has shown me six specimens of this interesting 

 Oligochaete, mounted as microscopic slides, which he took from the shell 

 of a water-snail (Zdmncea peregra) got in the marl pit at Davidson's Mains, 

 near Edinburgh, in June 1904. About a dozen of the worms were 

 protruding from the mouth of the shell, which contained a living mollusc. 

 Allusion to this occurrence was made by me in a former paper in the 

 Society's Proceedings (vol. xvii., p. 31, footnote). 



[Nais elinguis, Mull. 

 From a pool at Callander in Sept. 1906, I obtained a Naid which 1 

 made out to be of this species, but confirmation of my identification is 

 desirable before placing it unreservedly on our list.] 



Stylaria lacustris (L.). 



Nais proboscidea, Dalyell in "Powers of the Crentor," vol. ii. (1853) p. 131. 



Common in ponds and pools among the potamogetons and other water 

 plants. 



1 "Powers of the Creator," vol. ii., 1853, p. 130, pi. 17, f. 1-5. 



2 "Catalogue of Non-parasitic Worms," 1865, pp. 71, 336. 



