280 Part I[I1.—Ninth Annual Report 
CLADOCERA. 
Holopedium gibberum, Zaddach. Frequent in the three lochs. 
Daphiia jardini, Baird. Loch Ness, frequent also in Loch Oich. 
- longispina, ? Miller. Loch Ness. 
Bosmina longirostris (Miller). Loch Ness, not very common. 
Polyphemus pediculus (Linné). Frequent in the three lochs. 
Bythotrephes longmanus, Leydig. Loch Ness and Loch Oich, common. 
Diatomacea were also frequent in the lochs, especially in Loch Lochy— 
Astervonella, with the frustules arranged in their characteristic star-like 
clusters, being common, especially in Loch Lochy. 
4, LismorE Isnanp Locus, ARGYLLSHIRE. 
There are three small lochs on Lismore Island, viz., Loch Bail nan 
Gobhann (or, as it is called in the Sportsman’s Guide, Loch Balnagowan), 
Loch Kilcheran, and Loch Fiart. The first two were examined about the 
middle of July, the other later on. 
Loco BALNAGOWAN. 
This loch, which is of small size, is moderately deep towards the south 
end, but the north end is shallow and much overgrown with vegetation, 
comprising water-lilies, Polygonum, Scirpus, grasses, &c. At the time 
of our visit the water was of a whitish colour and obscure, as if fine, light- 
coloured mud were held in suspension. On examining a portion of the 
water with the microscope, a pale-coloured or bleached-like conferva (?) in 
the form of small jointed rods, about 1 mm. long, was seen to be present 
in enormous numbers, and was no doubt the chief, if not the only, cause 
of the peculiar coloration and obscurity of the water. 
The loch is leased by the Lorne Angling Association, who keep a boat 
on it, and we had the use of this boat for the examination of the loch. 
I am informed that many of the trout in this loch, which are said to be 
of fine quality, are more or less deformed by having the back-bone 
abnormally bent, usually in a lateral direction. The bottom of the loch 
consisted of a greyish marl, largely composed of dead molluscan shells. 
The entomostracan fauna was abundant. The curious and somewhat rare 
Infusorian, Ceratiwm longicorne, Perty, and also Peridinium tabulatum, 
Ehr., were common, as were also the Rotifera, Anwrea cochlearis, Gosse, 
and Anurea aculeata, Ebr. Ceratiwm longicoine was discovered by 
Schrank and Perty in the Bernese Alps in 1848; in Calcutta by Major, 
now Colonel, Stewart- Wortley in 1859, and in 1879 in Olton Reservoir, 
near Birmingham, by Levick. I am unable to find any Scotch record 
for it.* Ostracoda were fairly common, and included the rather rare and 
pretty Cypris obliqua, Brady. Among the Cladocera observed was 
Chydorus globosus, a rare species. 
Loco KILCHERAN. 
Loch Kilcheran, to the south of Loch Balnagowan, and nearly inter- 
mediate between it and Loch Fiart, is also comparatively small, being 
only about a mile in circumference. Its margin nearly all round, but 
especially at the north and south ends, is overgrown with tall reeds and 
* Mr J. Hood, Dundee, informs me that he has observed this Ceratium in Black 
Loch, near Blairgowrie, but has not recorded it. 
