The Bdelloid Rotifer a of the Forth Area. 227 



natural section. R. longirostris is related to R. tardus^ 

 R. socialis to R. macrurus. 



R. vulgaris, Schrank. 



Near Eoslin, March ; Upper Elf Loch, November ; Winch- 

 burgh ; Bridge of Allan, December. 



R. macrurus, Schrank. 



In Sphagnum, Bavelaw Moss, February ; Aberfoyle, 

 December. 



R. tardus, Ehr. 



Duddingston, Nether Habbie's Howe, Doune. 



R. longirostris (Janson), (6). 



I think there can be no doubt as to the close affinity of 

 this species with R. tardus. Beyond the lack of eyes, and 

 the presence of the series of processes on the neck of this 

 species, they are almost identical. 



Duddingston, Fullarton, Hopetoun, Aberdour, Loch Leven, 

 Bridge of Allan, Doune. 



R. citrinus, Ehr. (6), (18). 



This species appears to have been generally overlooked. 

 I find it quite common in ponds in various parts of Scotland. 

 Lochgelly, Upper Elf Loch, Winchburgh. 



R. trisecatus, Weber (16). 



On Elodea from ditch, near Winchburgh, December. 



R. socialis (KelL), (8). 



I find this to be the commonest of the species parasitic on 

 Asellus in Scotland. 



Ditch near Winchburgh, on Aselhts, December. 



Genus Adineta. 



Adineta vaga, Davis. 



Eoslin, Duddingston, Bavelaw Moss, Nether Habbie's 

 Howe, Thornton, Ochils near Dollar. 



