68 Proceedings of the Royal Physical Society. 
THE COPEPODA. 
I shall now proceed to give a short account of the Copepoda 
of the district. 
This group is equally interesting with the preceding one, 
but rather more difficult to deal with; they want the hard 
shell-like covering of the Ostracoda, which allows of those 
organisms being conveniently mounted and preserved as 
cabinet specimens. The only manner in which the Copepoda 
can be preserved is by mounting them in balsam, or some 
other suitable medium, or by keeping them in methylated 
spirits; yet, notwithstanding this difficulty, they form a 
very profitable leisure-time study. 
The distribution of the Copepoda is, perhaps, not so capricious 
as that of the Ostracoda, yet here, as in the other group, we 
meet with examples of special interest. I shall mention one 
or two of these. In 1892 I had an opportunity of making 
an examination of Loch Morar in Inverness-shire, and ob- 
tained a number of rare Entomostraca; but, though the 
Copepoda were numerously represented, not a single specimen 
of Canthocamptus minutus was observed, and this is one of 
the most common of the fresh-water Harpacticidw. I do 
not, of course, mean to say that this species was entirely 
absent, but only, that, though a careful examination of the 
material collected was made (partly to ascertain if this 
Canthocamptus was present), no specimens were obtained. 
In the Journal of Microscopical Science for 1868, Professor 
G. S. Brady described a small species of Copepod, specimens 
of which had been sent to him by Mr Atthey. They had 
been found by Mr Atthey “living amongst films of gelatinous 
alge” on “the damp roof of the pit-workings of the low 
main, West Cramlington Colliery, near Newcastle,” and the 
species was named Attheyella eryptorum, after its discoverer. 
The locality described appeared to be the only known habitat 
of the species till last year, when it was obtained in Loch 
Morar, in material collected by dragging a small tow-net 
1 An account of this loch will be found in the Annual Report of the 
Fishery Board for Scotland for 1893. 
