300 THE FKESH-WATER LOCHS OF SCOTLAND 
cosmopolitaD of all animals ; it is found in both polar regions, the 
tropics, and in all the continents. 
C. lo)igiceps, Murray.— Very rare in Scotland, being only known in 
one loch ; this curious species has been found in two widely separated 
parts of Africa, Uganda and Cape Colony, and in Fiji and Hawaii. 
C. crucicorms^ Murray. — Apparently very rare and local ; only 
known in two places in Scotland, Loch Rannoch and Fort Augustus 
(abundant in one small bog hole at the latter place) ; also W. Ireland. 
C. armata^ Murray. — Apparently rare, only known till recently 
from the Caledonian Canal and lochs on it ; its range has been 
extended to Orkney by its discovery in the Loch of Harray. 
Rotifer trisecatus^ Weber. — Not very rare in ponds, though rare 
in lakes. 
Polyarthra eurijptera, Wier. — Though exact details of its distribu- 
tion are not yet available, it is known that this species has a pretty 
wide range, especially in the north and west. 
Tnarthra longiseta^ Ehr. — Pi-etty generally distributed, but local. 
It may be that this species and Floscularia pelagica have a limited 
season, which might account for their seeming comparative rarity. 
Alhertia bernardi, Hlava. — I am informed by Herr Hlava that 
the species of Alhertia recorded by me ^ as ^. i?it?-usor, Gosse, is really 
A. hernardi^ and I correct my mistake accordingly. I know not 
whether the true intrusor also occurs in Stylaria in this country. I 
only know one species. 
Notommcda pumila^ Rousselet. — This appears to be really a rare 
species. The conspicuous characters of the toes make it unlikely that 
it would be overlooked. 
ProaJes daphnicola^ Thompson. — The single occurrence, on a worm 
at a depth of 500 feet in Loch Ness, of this species, usually found 
on Crustacea, is one of the curious, isolated facts for which there is 
yet no explanation. 
Fureularia reinJiardt'i^ Ehr. — Frequent in the plankton of lochs, 
also in the littoral region, in streams, and in the sea ; the species 
varies so greatly in size that there is some doubt as to its identity 
in all cases. 
Arthroglena lutkeni^ Berg. — This species, found at the Loch of 
Swannay in Orkney, was not seen alive, but was identified by the 
characteristic toes. 
Dinocliaris similis, Stenroos. — Though only yet seen in Loch Ness, 
it is likely that it has been confused with D. tetractis, which is 
supposed to be extremely variable. 
Polychtctus collinsU Gosse, and P. .mhquadratus^ Perty, though 
littoral forms, are not infrequently found in the plankton, and on one 
^ Trans. Roy. Soc. Edi?i., vol. xlv. j). 178, 1906. 
