322 Proceedings of the Royal Physical Society. 
because Mr Brook was, for several years, a respected Fellow 
of this Society, taking much interest in its welfare, and, 
also, because the collections are fairly interesting in them- 
selves, and add considerably to our knowledge of the dis- 
tribution of the fresh-water Entomostraca of Scotland. 
The collections, contained in twelve bottles, repre- 
senting an equal number of separate gatherings, were 
from the following lochs :—“Swiss Loch,” “Loch Uisg,” 
“Sheep Loch,’ “American Loch,” “Loch Airdeglais,” 
“Middle Loch,” and “Loch Squabain.” The names of the 
three lochs—the “Swiss Loch,’ “Sheep Loch,” and 
“ American Loch,’—are probably the local names for some 
small tarns in the neighbourhood of Loch Uisg, for the 
names do not occur on the one-inch Ordnance Survey map 
of the island of Mull, but I think there can be no doubt of 
their being situated in the vicinity of Loch Uisg, from the 
circumstance that all four were visited on the same day, viz., 
the 26th February 1890:; Loch Uisg is, on the other hand, a 
well known, although comparatively small, fresh-water loch 
between the head of Loch Buy and Loch Spelve—two of the 
sea-lochs of Mull. The positions of the various lochs are 
more particularly referred to in the sequel. With these 
preliminary remarks I now proceed to notice each of the lochs 
separately, and in the order in which they are enumerated. 
1, THe “Swiss Locu.” 
As already pointed out, I have not been able to ascertain 
the position of this loch, but it very probably occurs some- 
where in the vicinity of Loch Uisg. It was visited on the 
26th of February 1890, and the only material collected there 
was a shore gathering, containing very few organisms. The 
only Entomostraca obtained were the following two species 
of Copepoda :— 
Diaptomus gracilis, G. O. Sars; féw. 
Cyclops serrulatus, Fischer ; few. 
Both of these are generally distributed throughout the 
British Islands. 
