144 
BATHYMETRICAL SURVEY OF 
Loch Derculich . — The characteristic animals were Diaptomus 
(brown), Baphnia lacustris (with parrot-shaped head), Bosmina oh- 
tusirostris (with long beak), N otholca longispina, and Dinohryon. 
Loch Scoly . — The most abundant animals were Daphnia lacustris ^ 
Diaptomus gracilis (dark brown, mostly immature), Conochilus volvox^ 
Bosmina ohtusirostris (small), and Peridinium tabulatum. 
Loch Rannoch.- — -The plankton of Loch Hannoch may be fairly 
taken as the type of all the large Scottish lochs. Almost every one of 
the species included in the list of the lacustrine organisms was found in 
it, and there was nothing in it not given in the list. Of the Entomos- 
traca, Bosmina was the most abundant. Skeletons of the Rhizopod 
Glathrulina elegans, though this is not a pelagic animal, were always 
found in it. The biology of the littoral region of the loch has 
been studied with some care by Mr. D. J. Scourfield and others, 
but as this region has not been studied in the other lochs of the 
system, it is thought better not to enter into the details of it 
here. 
Loch Bci. — Most of the common pelagic animals were not seen, while 
many species belonging rather to the shore (or littoral) fauna were 
numerous, as Eurycercus lamellatus, Acroperus harpcc, Alondla nana 
and A. excisa, Alona affinis and A. guttata, and Chydorus sphccricus. 
Many Hhizopods were observed, as well as mites and Ostracodes. 
TjocIi Laiclon. — Only the Entoniostraca of this loch were studied 
by Mr. D. J. Scourfield. The species were all the same as in 
Loch Rannoch. No collections were made of the other groups of 
animals. 
Ljochan Srdn Smeur . — Notwithstanding the high elevation and the 
early season at which it was examined, this loch was found to be 
exceptionally rich in both animals and plants, particularly in Rotifers, 
Rhizopods, and Desmids. Holopedium was here seen unusually early 
in ‘the season. Besides the ordinary pelagic animals, Diaptomus, 
Dajolinia, Bosmina, &c., Latona setifera was present. 
Loch Bhac. — The commonest animals were Diaptomus gracilis (red), 
Bosmina ohtusirostris (with long beak), Daphnia lacustris, Diaphano- 
soma hrachyurum. Among the Rotifers was the brilliant red and blue 
Notops pygmocus, and the curious Desmid Alicrasterias Wallichii was 
present. 
Loch Con. — Entomostraca were few, and Algse more numerous 
than usual. The commonest animal was Bosmina ohtusirostris (small). 
Diaptomus gracilis (some large, yellow, others red). The Rotifer 
Notops pygmocus was unusually large. 
Loch Tilt . — In common with a few other lochs, usually lying at 
considerable elevations, the only common animal was Diaptomus 
gracilis, so bright red in colour that the net, when taken up, seemed 
filled with blood. Hardly anything else was seen. 
