NOTES ON FRESH AND BRACKISH-WATER ENTOMOSTRACA 21 



of Altnaoul, and by the minor small ditch-like stream where 

 the late Duke's hatching-house was situated. 



There may be nothing new in these notes that throw 

 much light upon our darkness, but I think they may possibly 

 help if compared with notes from other rivers. 1 



NOTES ON FRESH AND BRACKISH - WATER 

 ENTOMOSTRACA FOUND IN ABERDEEN- 

 SHIRE. 



By THOMAS SCOTT, F.L.S. 



THE Entomostraca recorded in the following notes were 

 collected chiefly in the vicinity of the river Ythan, from a 

 short distance above the railway viaduct at Ellon to a 

 little beyond the point where the river is joined by the Burn 

 of Forvie. But in addition to the species obtained here, I 

 am enabled, through the kindness of Mr. R. M. Clark, B.Sc., 

 F.L.S. , to record three species from another district, two of 

 which are new to the Entomostracan fauna of Aberdeenshire ; 

 these are separately described at the end of this paper. 



I had two reasons for selecting for examination the part 

 of the Ythan referred to above. First, because of its being 

 within easy reach of Aberdeen, and, second, because the 

 lower portion of the river, being a tidal estuary, was likely 

 to yield a number of brackish-water Entomostraca, which are 

 always interesting since they form a kind of borderland 

 where the true fresh-water species are found merging into 

 those that are truly marine. 



1 Amongst other evidence offered at a meeting of the Commissioners of the 

 United States and Canada, Mr. Win. Murray is reported to have said that " the 

 results of his investigations went to prove that artificial culture did not lead to 

 any improvement of the fisheries of the United States or Canada. 



Of the river I have just spoken of, I do not think the same can be held true. 

 But all these divergent evidences given as the natural state in different river- 

 systems only proves that history of these rivers has still to be more carefully 

 worked out than it has been before, if we are to expect tangible results for more 

 general conclusions. But again, Mr. Henry Ffennel also condemns artificial 

 rearing, whilst Bickerclyke as strenuously upholds it. 



I may add, Loch Assynt is particularly subject, and sensitive to, aeration by 

 westerly winds, whilst Loch Awe is less so, but in very moderate winds becomes 

 muddy, from its shallowness and long weeds stirring up the bottom. 



