354 BATHYMETRICAL SURVEY OF 



The few species which only occurred in some of the lochs are noted 

 below. These are also generally distributed in summer, their scarcity 

 in these lochs being due to the late season at which they were visited. 



Daphnia. In all the lochs where Daphnia occurred, it was as the 

 variety galeata, a large form with the head angled. 



Holopedium gibberum. Only in Lochs Calavie and an Tachdaidh. 



Leptodora kindtii. Only in Loch Monar. 



Polyphemus pediculus. An Gead Loch. 



Cy clops strenuus. Present in most of the lochs. The Cyclops in 

 Loch Calavie were red-spotted. 



Diaphanosoma brachyurum. Found in four lochs an Tachdaidh, 

 Bunacharan, Mullardoch, and Lungard. 



Floscularia pelagica. Loch Monar. 



Conochilus. Both species, C . unicornis (the common lake species) 

 and C '. volvox, were present in Loch Monar. 



Sponge. A fresh-water sponge, species not determined, came up 

 attached to the sounding-rod, from depths of 6 or 8 feet, in Loch a' 

 Mhuilinn. The pieces were long, finger-shaped. 



