_ [Reprinted from ‘* The Annals of Scottish Natural History,” January 1902.] 
NOTES ON FRESH AND BRACKISH-WATER 
ENTOMOSTRACA FOUND IN ABERDEEN. 
SHIRE. 
By Tuomas 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. Clarke 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. 7 
