o 



36 Part III. — Eighth Annual Report 



MOLLUSCA. 



Sphserium corneum (Linne). Not common. 

 Pisidium amnicum. Eare. 



„ f ordinate (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 Common. 



CRUSTACEA. 



Daphniad^j. 



Daphnia pulex i Very Common. ) Ephippia also 



,, vetula, Frequent. j frequent. 



Copepoda. 



Diaptomus castor, Very common. 



Cyclops pulchellus, Common. 



„ strenuus, Frequent. 



„ gigas, Very common (several stages). 



Ostracoda. 



Cypria ophthalmica (Jurine). Frequent. 



Cypria serena (Koch). Frequent. 



Cyclocypris globosa (G. O. Sars). Not very common. 



Erpetocypris strigata (0. 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. 

 „ Jcingsleii, Brady and Robertson. Scarce. 

 Insect larvse, 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 larvse — chiefly 

 of the Phryganeidae — 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 of the Mollusca and Crustacea observed : — 



* Sphceriurn corneum is, however, very abundant in the covered passages through 

 which the burn runs from the sluice of Loch Coulter for several yards. 



