328 Proceedings of the Royal Physical Society. 
comparatively few places, and these are chiefly in the south 
and west. The present record is an extension of the dis- 
tribution of Cypris reticulata northward on the west side of 
Scotland ; on the east side we have a record of its occurrence 
at Loch Achnacloich, near Invergordon, Ross-shire. 
COPEPODA. 
The Copepoda recorded in this report, with, perhaps, one 
exception, belong to species that are more or less generally 
distributed throughout Scotland. Cyclops strenuus is much 
less common than the others, and its occurrence in the Mull 
lochs is of interest, as being an extension of its distribution on 
the West Coast. | 
CLADOCERA. 
Sida erystallina (Miller). 
This is a large and apparently a local species in Scotland. 
I have records of it from only two other places, viz., Greenan 
Loch, near Rothesay, Island of Bute, and Raith Lake, near 
Kirkealdy, Fifeshire, in both of which it is moderately 
common. 
Daphnella brachyura (Liévin). 
This species is considerably smaller, and is perhaps more 
generally distributed than the last, and, like it, seems to 
prefer the shelter of aquatic plants rather than the open 
water. 
Ceriodaphnia reticulata (Jurine). 
The distribution of Ceriodaphnia reticulata appears to be 
local, but the species may be a common one where it does 
occur. It was very common in Loch Strathbeg, Aberdeen- 
shire, in September 1890. 
Camptocercus macrourus (Miiller). 
This also appears to be one of the less common species of 
Scottish Cladocera. I have met with it in material from 
only two other localities in Scotland, viz., Castle Loch, 
Lochmaben ; and Loch Morar, Inverness-shire. 
