THE FRESH- WATER LOCHS OF SCOTLAND. 145 



Loch Moraig. Entomostraca were here scarce, and Protozoa and 



Algae abundant. The commonest organism was a form of Ceratium 



'tdinella, which was so abundant as to constitute a " Wasserblut." 



Loch Broom. This shallow, marshy pool, with Menyanthes growing 

 almost everywhere, yet had a quite ordinary lacustrine fauna, including 

 Diaptomus (dark brown), Daphnia lacustris (very large), Cyclops 

 strenuus (large hyaline), Bythotrephes . Conochilus was much the 

 commonest animal. An unusual form of Ceratium hirundinella, 

 having both the median spines long, occurred. 



Loch Or die. The most abundant animals at the time this loch was 

 visited wereHolopedium, Daphnia (parrot-shaped head), and Diaptomus 

 (hyaline). Bosmina of two forms was found B. obtusirostris (small) 

 and B. longispina. 



Loch nan Eun. The highest loch in the Tay system visited. The 

 predominant animal was Diaptomus yracilis (blood-red); Daphnia 

 hu-u.it r is (very large), Bosmina obtusirostris, and several species of 

 Desmids, notably Staurastrum arctiscon, were present in some numbers. 

 There was a scarcity of smaller organisms. 



Loch Shechernich. The water was turbid from the abundance of 

 life. The most conspicuous examples were Diaptomus (dark red, red 

 and yellow, red and blue, or all blue), probably D. Wierzejskii, 

 Daphnia (parrot-shaped head), Bosmina (very large, purple), Xotholca 

 longispina, and Polyarthra. Asterionella was of a smaller size than 

 usual. Numbers of a small yellow water-mite were seen. 



Loch Auchenchapel. Ceratium hirundinella formed a " Wasser- 

 blut " in the loch at the .time it was visited. Other common animals 

 were Bosmina obtu*iro*tris, Daphnia lacustri-s (small), Diaptomus 

 (reddish), f'onocliilus. 



Loch of Lintrathen. The water was very clear, and organisms 

 sparingly distributed. Daphnia lacustris (large) and Diaptomus 

 y rat: Hi* (hyaline) were the only animals at all common. 



Lnrh BtnachaUy. Hnlopedium was common on the surface, but not 

 below. Diaptomus t/racilis (brown, mostly immature) and Daphnia 

 (large) were most abundant. Bosmina was scarce. 



Long Loch. Very few animals were present, the commonest being 

 f(irtt*tris, Diaptomus yracilis (hyaline), and Conochilus. 



Pitlyal Lorji. This differed from most lochs visited about the same 

 time in the general scarcity of life, especially of Entomostraca. It was 

 one of the few lochs in the system where Bosmina cornuta took the place 

 of the common B. obtusir<>*fri. There was a " Wasserblut " of a pale 

 filamentous Alga. Volvo/: and several other Algae occurred. Although 

 in those various respects the biology approached the pond type, 

 Leptodora was rather numerous. 



For far Loch. The water was very turbid throughout, yet the fauna 

 was mainly lacustrine, the commonest animal being Cyclops strenuus. 



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