217 THE FRESH-WATER ENTOMOSTRACA OF ABERDEENSHIRE 
ing from one loch recently visited (Loch of Park), as many 
as forty-four species were obtained, while thirty-nine, thirty, 
and twenty-seven species respectively have been obtained in 
gatherings from other lochs. 
I propose, in the following notes, to mention a few of 
the rarer or more interesting species that have been ob- 
served ; and those that belong to the Cladocera will be 
referred to first, and afterwards those belonging to the 
Ostracoda and the Copepoda. 
THE CLADOCERA. 
The Cladocera obtained in gatherings recently collected, though 
perhaps not more numerous individually than the Ostracoda or 
the Copepoda, are represented by a greater number of species. All 
the families of the Cladocera, except the Holopedide and Lepto- 
dorid@, are represented, and both Holopedium and Leptodora may 
yet be found in some of the hill lochs, but as these are pelagic 
forms, a boat and tow-net may be required to capture them; the 
gatherings referred to in these notes are all shore gatherings. 
The SIDAD# are represented in recent gatherings by Sida 
crystallina (O. F. Miller) and Daphnella brachyura (Lievin), (or 
Diaphanosoma brachyurum as it is now called) ; the first is common 
in the Loch of Skene, and the other is equally common in Loch of 
Park. Latona setifera, another member of the same family, and 
much rarer than either of the two species just referred to, was also 
obtained in Loch of Park, as well as in a gathering from Corby 
Loch, but only one or two specimens of Zaz¢ona were obtained in 
each of these gatherings. 
The DaPHNID~ observed in recent gatherings include several 
interesting species, but I can only at present record three of them, 
viz. Certodaphnia laticaudata, P. EK. Miller, Ceriodaphnia megalops, 
G. O. Sars, and Scapholeberis mucronata (O. F. Miller). The first, 
which has a comparatively broad and angulated post-abdomen, was 
obtained in Corby Loch. The second, which is the largest of the 
British species of Certodaphnia, and which occurred in a gathering 
from Loch of Park, has not previously been observed in Scotland ; 
in this species the shell is distinctly but somewhat irregularly striate, 
after the manner of a S7mocephalus—only females have been observed 
so far. The third (Scapholeberis) has been obtained in Loch of 
Skene, Loch of Park, and Corby Loch, and also in one of the 
ponds in Duthie Park. Amongst the specimens collected, some 
have the head rounded and without a tooth, others possess a vertex 
tooth which varies in length in different individuals, and the length 
of the posterior spines also varies more or less. 
