THE FRESH- WATER LOCHS OF SCOTLAND. 193 
dozen species of Desmids were observed, including Staurastrum longis- 
pinum and S. gracile, var. hulhosum. 
Loch Oivsheich. — ^Tbe fauna was much richer than that of Loch 
Bad a’ Ghaill, with which, from position and size, it is best comparable. 
Diaptomus gracilis and D. laciniatus were both present. The Daphnia 
was D. galeata. There were many filamentous Algae and Desmids, 
among which occurred Staurastrum Braziliense. 
Loch Shinaskinh. — The plankton was very rich, and, notwithstanding 
the large size and considerable mean depth of the loch, resembled that 
of a shallow loch in the great numbers of Rotifers, Desmids, and 
Protozoa. There were two species of Diaptomus^ D. gracilis and D. 
laciniatus, and two of Daphnia, D. lacustris and D. galeata. Among 
the Rotifera were two species which, though pelagic, are not usual in 
large lakes, viz., a Synchceta and a Ploesoma. The Desmids included 
Staurastrum Braziliense and S. ophiura. 
Loch Fionn. — ^This loch, though long, is so narrow as to be little 
more than an expansion of the river. When in spate, as on the occasion 
of the visit of the Lake Survey, there is a decided current down the 
loch. As would be expected in the circumstances, life was very scarce 
and of few species. Two forms of Bosmina were present, B. ohtusirostris 
and its variety B. longispina. 
Loch an Tuirc. — ^Entomostraca were numerous, but of few species. 
Rotifera were scarce. Filamentous Algse were abundant, but there 
were few Desmids. 
Loch Beannach. — Organisms were not very abundant. Only the 
commonest pelagic Entomostraca were present. Rotifera were more 
numerous, including, in addition to the usual pelagic species, Gastropus 
stylifer and a species of Floesoma. 
Loch na Loire Daraich. — The very abundant fauna of this loch 
closely resembled that of the adjacent Loch Druim Suardalain, the 
most notable difference being the more numerous Rotifera. Among 
these were Floscularia pelagica, Triarthra longiseta, Pterodina patina, 
G opens cerberus, Dinocharis Collinsii. Among the numerous Desmids 
were Micr aster ias furcata, M. pinnatafida, Staurastrum, grande, and 
S. longispinum. 
Loch Druim Suardalain. — This shallow loch had the richest fauna 
found in the lochs of the district. The flora was also very rich. About 
a dozen species of Rotifera were seen, including Gallidina Brycei. 
Over thirty species of Desmids occurred, among which were Staurastrum 
grande, S. ophiura, and S. sexangulare. There was nothing among 
the Entomostraca calling for remark, only the commoner pelagic and 
shallow-water species being observed. 
Ljoch Maol a’ Choire. — Crustacea were very abundant, including a 
species of Gammarus. Diaptomus Wierzejskii was the only Calanid 
observed. It was in a collection from this loch that the species was 
o 
