of the Fishery Board for Scotland. 



241 



LOCHAN NAM FaOILEANN — NORTH AND SOUTH.* 



These two lochs, which are situated in the same stretch of peat-bog 

 with Loch Scotagary, from which the south loch is distant about 300 

 yards, are separated from each other by quite a narrow ridge of hard 

 ground. There appeared to be no connection whatever between them ; 

 but though the distance that separated the one loch from the other was 

 so small, there was a considerable difference in the number and variety of 

 the organisms obtained in the two lochs. In the south loch one species 

 of bivalve Mollusca (Pisidium, sp.), and Gammarus duabeni were observed, 

 also the following Copepoda and Cladocera : — Cyclops strenuus (very 

 common with ovisacs), Cyclops serrulatus, and Cyclops iimbriatus ; 

 Diaptomus serricornis, and Attheyella crassa ; Drepanotlirix dentata, 

 Bosmina longirostris, Alonopsis elongatus, Alona quadrangular is, and 

 Chydorus sph&ricus, — in all twelve species, exclusive of species of 

 Notonectidse, Water-mites, Insect larvae, &c. ; whereas in the north loch 

 twenty-four species were obtained. The organisms identified in the 

 gatherings from this loch comprised two species of Pisidium; seven 

 species of Copepoda (including Cyclops affinis (G. O. Sars) with oviscas) ; 

 Diaptomus serricornis, and Ophiocamptus sard ; and fifteen species of 

 Cladocera. It is somewhat curious tliat there are no records of Ostracoda 

 in this loch, where other groups of Crustacea are so well represented ; 

 but it is quite possible some species of them may exist in the loch, though 

 not observed in our gatherings, for it is not pretended that our examin- 

 ation of the various lochs was an exhaustive one. 



LOOH NA NlGHINN RUAIDHE. 



About 600 yards (or the one-third of a statute mile) north-west from 

 the northernmost of the two lochs last described brings us to Loch na 

 Nighinn Ruaidhe, which is surrounded on all sides by bog-land and 

 heather ; some low hilly ground separates this one from the others. When 

 we reached this loch we discovered that it had an interest for other people 

 as well as for us : two clergymen were at work angling for trout, and when 

 the purpose of our visit was explained to them, they appeared greatly 

 interested. The trout in this loch are small but are said to be very good. 

 Twenty-two species of Crustacea and one of Mollusca were obtained as 

 the result of our examination of Loch na Nighinn Ruaidhe ; the common 

 brown Hydra was observed to be frequent in this loch ; Water-mites, 

 Insect larvaB, Diatoms, &c, were more or less frequent. The Crustacea 

 obtained comprised seven species of Copepoda, one of Ostracoda, and four- 

 teen species of Cladocera. Diaptomus serricornis was found in this loch, 

 and some large and fine Acantholeberis curvirostris. 



Loch an Duin. 



The distance from Castlebay to Loch an Duin as the crow flies is 

 only about 3J miles, but by the road, such as it is, the distance is at least 

 3 miles more. The road that crosses the Island from east to west between 

 the head of Bay Hirivagh and Ard Allasdale passes close along the north 

 side of Loch an Duin. This loch appears to be one of the largest lochs 

 on the Island of Barra, and it is considered to be a fairly good loch for 

 trout. It was examined by us on the 21st of May, and the result was 

 rather disappointing, — only nine species of Crustacea altogether were 

 obtained in the gatherings collected here. Diaptomus strricornis was 



* Or, more correctly, North-west and South-east. 



