219 THE FRESH-WATER ENTOMOSTRACA OF ABERDEENSHIRE 
Park ; P. uncinatus was also observed in Corby Loch. Chydorus 
barbatus (Brady) occurred in Loch of Skene, Bishop Loch, and 
Loch of Park. 
The PoLYPHEMIDZ are represented by only one species—Foly- 
phemus pediculus (Lin.), which occurred in all the lochs examined 
except Corby Loch. JLythotrephis longimanus, Leydig, another of 
the Polyphemidz so common in some of the Lochs of Scotland, has 
not been observed in any of the Aberdeenshire lochs hitherto 
examined. 
THE OSTRACODA. 
Only eight species of Ostracoda have been observed in the 
gatherings of fresh-water Entomostraca recently collected, ail of 
which are moderately common. Cyris exculpta, Fischer, occurred 
in Loch of Skene, Loch of Park, and Corby Loch; Aerjpetocypris 
veptans (Baird) and Cypridopsis villosa (Jurine) were frequent in Loch 
of Park, while Lemnicythere inopinata (Baird) was obtained in Corby — 
Loch. In September 1890 I examined the north end of Loch 
Strathbeg,! and obtained ten species of Ostracoda there ; but, with 
the exception of Cypridopsis aculeata (Lillj.) and Llyecypris beplicata 
(Koch), they are all similar to those recently observed. Only one 
species of Candona (Candona candida) has been observed in the lochs 
of Aberdeenshire hitherto examined. 
THE COPEPODA. 
The Copepoda obtained in the Aberdeenshire lochs recently 
examined comprise even a greater number of rare forms than those 
that have been found amongst the Cladocera, but these rare forms 
belong partly to the Cyclopide and partly to the Harvpacticide ,; the 
only Diaptomus observed hitherto is the common Diaptomus gracilis, 
G. O. Sars, which was moderately abundant in Loch of Skene, and 
was also obtained in Corby Loch and Bishop Loch. Amongst the 
Cyclopide, Cyclops dybowskii, Lande, was moderately frequent in a 
gathering from Loch of Park; this species requires careful examina- 
tion to distinguish it from Cyclops otthonoides, G. O. Sars. Loch 
Lomond is the only other loch in Scotland where I have obtained 
this species ; it occurred there in a shore gathering collected to the 
south of Balmaha. Cyclops languidus, G. O. Sars, another rare 
species, was obtained in a gathering from Corby Loch; this Cyclops, 
which has the antennules sixteen-jointed, has only hitherto been 
observed in Scotland in Loch Doon in Ayrshire. Cyclops fuscus 
(Jurine) was obtained in a gathering from Loch of Park, so also 
were Cyclops macrurus, G. O. Sars, and Cyclops affinis, G. O. Sars ; 
1 See ‘“*Ninth Annual Report of the Fishery Board for Scotland,” part iii. 
p. 282 (1891). 
