374 Lhe Upper Elf Loch, Braids. [Sess. 
it in a genus by itself, as it was not a Furcularia (in his Supplement to 
‘The Rotifera, p. 19). Itisa large and handsome species. Mr Western 
has found it in England, and I have found it in Scotland and in 
Ireland. 
The mites are a group of the Arachnida, to which, unfortu- 
nately, very few workers devote themselves. Several genera 
and species are present in this sheet of water, but we have 
been unable to identify some of them. In two gatherings 
taken during the last year, a few specimens of a male or tailed 
Swimming mite were found. The male mites are as rare as 
are the male Daphnias, to be afterwards referred to, amongst 
the Entomostraca; and they are, besides, so different in 
appearance from the round or female mites, that it is extremely - 
difficult to pair them. The male mite found belonged to the 
Arrenuri (Arrenwrus buccinator), and was a beautiful creature 
—the body blue, with tail yellow, shading off to deep orange, 
and the eyes bright vermilion. The spur on the last joint 
but two of the hind legs, characteristic of the male, was very 
large. The motions of the mites in the water are even and 
graceful,—very unlike the jerky movements of the water-fleas, 
for example. It may be added that an insect found in the 
loch, or rather on its surface, which was very plentiful in 
some seasons, was the Common Water Spring-tail (Podura 
aquatica). 
The study of the crustacean inhabitants of the Upper Elf 
Loch has proved very interesting. The following brief sum- 
mary shows what has been done, and the results that have 
been obtained, in the course of our study of these organisms. - 
Of the series of gatherings collected, twelve have been ex- 
amined for crustacea. Four of these gatherings were made 
in 1896—in March, May, July, and October; six were 
collected in 1897—in March, May, June, July, September, 
and November; while in the present year (1898) one gather- 
ing was taken in February and another in April. The total 
number of crustacean species that have been obtained from 
these twelve gatherings is thirty-two. Sixteen species, or 
half of the total number, belong to the Copepoda, five to the 
Ostracoda, and eleven to the Cladocera. The Copepoda belong 
to two distinct groups—viz., the Cyclopide and the Harpac- 
ticide. The first is represented by nine and the second by 
