380 Proceedings of the Royal Physical Society. 



Scapholeberis mucronata, 0. F. Miiller (p. 179). 



To the localities given for this species add : — Side of river 

 Teith, at Callander, September 1906 (W. Evans). 



Cyclops Leuckarti, Claus (Part II. p. 347). 



While this part of the Catalogue was passing through the 

 press, Mr W. Evans sent me numerous specimens of a 

 Cyclops which he had recently captured at the Falls of Leny, 

 by holding a net so that some of the falling water would 

 pass through it. The identification of the specimens some- 

 what puzzled me at first, but on carefully dissecting one 

 or two of them, I found them to be the young of Cyclops 

 Leuckarti; they were in the penultimate or antipenultimate 

 stage; the segmentation of the body being slightly in- 

 complete, while the antennules were furnished with only 

 eleven articulations. Loch Voil, one of the two lochs from 

 which the species is recorded, is situated to the north of 

 Ben Ledi, and the river Balvaig carries its overflow water 

 to Loch Lubnaig ; this, in turn, is the source of the river 

 Leny. It is probable, therefore, that Cyclops Leuckarti occurs 

 in this loch also, though I have not as yet found it there. 

 The loch and river were in flood when Mr Evans visited the 

 Falls, and the specimens were very likely carried from the 

 loch by the increased force of the current. 



The normal habitat of Cyclops, as of most fresh-water 

 Entomostraca, is in the comparatively still waters of lochs, 

 ponds, and other similar places, and their presence in the 

 rapid currents of rivers is usually accidental. The occurrence 

 of this Cyclops in the Leny is, therefore, of interest from its 

 bearing on the question of distribution, and as showing 

 that the species is probably present in Loch Lubnaig 

 as well as in the other two lochs from which it has been 

 recorded. 



