282 Part III. — Ninth Annual Report 



CRUSTACEA. 



Amphipoda. 



Oammarus pulex (Linne). Frequent in and about the three lochs. 



COPEPODA. 



Diaptomus gracilis. Loch Balnagowan. 

 Cyclops tcnuicornis. Loch Kilcheran. 



,. scrrulatus. Frequent in the three lochs. 



,, crassicornis. Lochs Balnagowan and Kilcheran. 

 Ganthocamptus minutus. Frequent in the three lochs. 



OSTRACODA. 



Cypria ophthalmica (Jurine). Frequent in the three lochs. 



,, serena (Koch). Frequent with the last. 

 Cyclocypris globosa (G. 0. Sars). Balnagowan and Kilcheran Lochs. 

 Scottla browniana (Jones). Loch Kilcheran, not common. 

 Cypris obliqua, Brady. Loch Balnagowan, frequent. 



,, incongruens (0. F. Miiller). Loch Balnagowan, rare. 

 Erpetocypris reptans (Baird). In the three lochs. 



,, olivacea, Brady and Norman. Lochs Balnagowan and Kilcheran. 



,, robertsoni, Brady and Norman. Kilcheran Loch, scarce. 



,, tumefacta (Brady and Robertson). Lochs Balnagowan and Kilcheran. 

 Cypridopsis vidua (Miiller). In the three lochs. 



,, villosa (Jurine). Lochs Balnagowan and Kilcheran. 



Potamocypris fulva, Brady. In the three lochs, frequent. 

 Notodromus monacha (Miiller). Loch Balnagowan, frequent. 

 Candona Candida (Miiller). Frequent in the three lochs. 



,, lactea, Baird. Lochs Balnagowan and Kilcheran. 



,, pubcscens (Koch). In the three lochs, not uncommon. 



,, Tcingsleii (Brady and Robertson). Distribution as the last. 

 Ilyocypris gibba (Ramdohr). Lochs Balnagowan and Kilcheran. 

 Darwinella stevensoni, Brady and Robertson. Loch Kilcheran, rare. 

 Limnicythere inopinata (Baird). In the three lochs, frequent. 



Cladoceea. 



Simoccphalus vetulus (Miiller). Loch Kilcheran. 



Ceriodaphnia punctata (P. E. Miiller). Loch Balnagowan, not common. 



Bosmina longirostris (Miiller). Loch Balnagowan. 



,, longispina, Leydig. With the last. 

 Lynceus quadrangidaris (Miiller). Lochs Balnagowan and Kilcheran. 

 Chydorus globosus, Baird. Loch Balnagowan, not common. 

 ,, sphcericus (Miiller). In the three lochs. 



As already stated, Infusoria and also Diatomacea were present in 

 Loch Balnagowan in considerable abundance. The more conspicuous 

 of the Infusoria have already been referred to ; the more common of the 

 Diatomacea were Aste?'ioiiellaformosa, with its star-like arrangement of the 

 frustules, Pediastrum selencea, various species of Navicula, &c. Desmids 

 were also of frequent occurrence. 



5. Loch Steathbeg. 



This loch, which is situated one and a half miles west from Rattray 

 Head, Aberdeenshire, is about two miles in length by about three-quarters 

 of a mile broad. It is separated from the sea by a ridge of bent-covered 

 sandhills, nearly a. mile in width. In the Old Statistical Account of 

 Scotland (1793), it is said "there is a tradition that in the beginning of 



