146 BATHYMETRICAL SURVEY OF 



Daphnia lacustris (large) was also common. The Cyclops was covered 

 with parasites of many species, both animal and vegetable. 



The lochs which are drained by the Lunan burn form a connected 

 series, all of moderate size or very small and shallow, several being 

 quite stagnant and overgrown with weeds. The most important are 

 Lochs of the Lowes, Drumellie, and Clunie, the last being the deepest 

 of the whole chain. Volvox was present in most of the lochs. 



Loch of Craiglush. Most of the ordinary pelagic animals were seen. 

 Holopedium was abundant. Daphnia was tinged with pink, and some 

 males were seen; Diaptomus was dull brown; Bosmina was small. 

 Several small Algae, as Volvox, Pediastrum, Eudorina, were common, 

 and several Rotifers, as Sacculus viridis and a species of Synchceta. 



Loch of the Lowes. The plankton resembled that of Loch Craiglush, 

 but differed in a few points. Holopedium was more numerous, Daphnia 

 larger and not pink, Bythotrephes was seen, and there were fewer Algae 

 and Rotifers. 



Loch of Butterstone. Life was abundant, and the species were 

 almost all the same as in Loch Craiglush. There was less difference 

 between those two lochs than between Loch Craiglush and Loch of the 

 Lowes, which are connected by a broad canal. The Daphnia was 

 pink-tinged as in Loch Craiglush, and there were some males. Another 

 form of Daphnia also occurred, larger, and with a purple spot on each 

 valve. 



Lochs Drumellie and Clunie. These two lochs may be treated 

 together, as they are connected by a short burn and differ little in the 

 character of the plankton. The Daphnia in both had the parrot-shaped 

 head which results from the elimination of the depression in the fore- 

 head. Bosmina was not noted in either. Volvox was more plentiful in 

 Loch Drumellie, and Leptodora was common in it and not seen in 

 Loch Clunie. 



Rae Loch (or Ardblair Loch). The most common animal was 

 Notholca longispina. The Daphnia was small, the Diaptomus mostly 

 immature, and Bosmina was not seen. A large bizarre-shaped In- 

 fusorian with green body-contents was numerous. 



Black Loch. The only common organisms were Diaptomus (pale 

 red), Daphnia (large), Polyphemus, and some small Diatoms. 



White Loch and Fingask Loch. These two lochs, which are con- 

 nected by a short burn, are very similar, Daphnia (large) being much 

 the most abundant animal, a few bearing ephippia and some males 

 being seen. Diaptomus was hyaline and immature. Volvox was more 

 plentiful in Fingask Loch. Lejjtodura was only seen in the White 

 Loch. 



Stormont Loch. The water of this stagnant pond was quite turbid 

 and yellow in colour from the superabundance of Daphnia. The nets 

 could not be drawn through the water in the usual way without getting 



