280 Part III. — Ninth Annual Report 



Cladocera. 



Holopedium gibberum, Zaddach. Frequent in the three lochs. 

 Daphnia jardini, Baird. Loch Ness, frequent also in Loch Oich. 



,, longispina, ? Miiller. Loch Ness. 

 Bosmina longirostris (Miiller). Loch Ness, not very common. 

 Polyphemus pediculus (Linne). 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 — 

 Asterionella, with the frustules arranged in their characteristic star-like 

 clusters, being common, especially in Loch Lochy. 



4. Lismore Island Lochs, 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. 



Loch 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 Lome 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, Ceratium longicorne, Perty, and also Peridlnium tabulatum, 

 Ehr., were common, as were also the Rotifera, Anuroea cochlearis, Gosse, 

 and Anuraaa aculeata, Ehr. Ceratium longicorne 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. 



Loch 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. 



