SCOTTISH FRESHWATER PLANKTON. §21 
and is situated in a wild hilly district, although the hills in the 
immediate neighbourhood seldom rise higher than 1500 feet. 
Loch a Gharbh Bhaid Mhoir is situated in a very wild region 
north-west of Ben Arcuil (2580 feet), and is very deep for its 
size; it is about a mile and a half in length and less than a 
quarter of a mile broad. 
The two Rotifers Notholca longispina, Kellicott, and Anurea 
cochlearis, Gosse, were abundant in both these lochs. The 
Heliozoan Clathrulina elegans, Cieuk., was by no means un- 
common in Loch Shin. Ceratiwm hirundinella occurred in both 
lochs, and was particularly abundant in Loch a Gharbh Bhaid 
Mhoir. From the latter loch Lemmermann reports the occur- 
rence of Peridinium Willei, Huitfeldt-Kass. 
Loch Mor Bharabhais, Lewis, Outer Hebrides. 
This loch is a little more than a mile in length and rather less 
in width ; it is situated near Barvas quite close to the sea, and 
is somewhat shallow. The surrounding land is not many feet 
above sea-level, and the margin of the loch is in some places 
quite sandy. The material was collected in August 1902 by 
means of a boat. . 
The Rotifer Anurea cochlearis, Gosse, was abundant, and the 
three following species of Rhizopods occurred profusely :— 
Arcella discoides, A. vulgaris, A. vulgaris var. gibbosa, and 
Trinema enchelys. A long-spined form of Mallomonas acaroides, 
Perty, was also observed, but not in abundance. One of the 
features of this plankton was the abundance of the lower forms 
of the green alge. 
Loch Laxadale, Harris, Outer Hebrides. 
This loch is situated amongst rocky hills near Tarbert, the 
highest mountain in Harris (Clisham, altit. 2622 ft.) being only 
three miles distant. It is about one and a half miles long, a 
quarter of a mile in width, and is about 40 ft. above sea-level. 
The material was obtained on a stormy day in August 1902, 
when there were very large waves on the loch, by passing a large 
volume of water through one of the silk nets. The following 
Rhizopods were observed :—Arcella discoides, Difflugia pyri- 
formis, D. globulosa, Centropyxis aculeata, Euglypha ciliata, and 
Trinema enchelys. 
