336 
Part III. — Eighth Annual Report 
MOLLUSCA. 
Sphserium corneum (Linne). Not common. 
Pisidium amnicum. Rare. 
„ fontinale (Draparnaud). Frequent. 
„ pusillum (Gmelin). Frequent. 
„ nitidum (Jenyns). Common. 
Valvata piscinalis (Muller). Common. 
Planorbis albus, Muller. Rare. 
„ contortus (Linne). Common. 
Limnsea peregra (Muller). Not common. 
„ truncatula (Muller). Not Commo n. 
CRUSTACEA. 
Daphniad^e. 
Very Common. ) Ephippia also 
Frequent. J frequent. 
Copepoda. 
Very common. 
Common. 
Frequent. 
Very common (several stages). 
Ostracoda. 
Cypriu ophthalmica (Jurine). Frequent. 
Cypria serena (Koch). Frequent. 
Cyclocypris globosa (G. O. Sars). Not very commcn. 
Erpetocypris strigata (O. F. Muller). Not common. 
„ tumefacta, Brady and Robertson. Not common. 
Cypridopsis villosa (Jurine). Not very common. 
Candona Candida (0. F. Muller). Frequent. 
„ rostrata, Brady and Norman. Scarce. 
„ kingsleii, Brady and Robertson. Scarce. 
Insect larvae, aquatic Coleoptera, Diatoms, and Confervse were also 
observed to be more or less common both in the loch and around its 
margins. 
2. The Coulter Burn from the Loch to Craigquarter Wood. 
After the loch had been carefully examined we next proceeded to ex- 
amine this section of the Coulter Burn. Its course is over open moorland, 
and there are comparatively few places along its banks which form suitable 
habitats for aquatic organisms. No Mollusca* nor Crustacea were observed 
in this part of the burn, the only things noticed being insect larvae — chiefly 
of the Phryganeidse — but in the few marshy places and pools along its 
sides several species of Entomostraca and one or two of Mollusca were 
obtained. The water of the burn was very pure. 
The following is a list uf the Mollusca and Crustacea observed : — 
* SpJuerium corneum is, however, very abundant in the covered passages through 
which the burn runs from the sluice of Loch Coulter for several yards. 
Daphnia pulex, 
„ vetula, 
Diaptomus castor, 
Cyclops pidchellus, 
,, strenuus, 
„ gig as, 
