288 Part ITT —Ninth Annual Report 
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MOLLUSCA. ; 
Mya arenaria, Linné. Loch Stenness, abundant. 
Pisidiwm roseum, Scholtz. Head of Loch Harray. 
Planorbis nautilews (Linné). Head of Loch Harray. 
Valvata cristata, Miller. Head of Loch Harray. 
Neritina fluviatilis (Linné). Loch Harray at Bridge of Brogar, common. 
Hydrobia ulve, Pennant. Loch Stenness, common. 
CRUSTACEA. 
CoPEPODA. 
Dias longiremus, Lillj. Common in Loch Stenness. 
Diaptomus gracilis, G. O. Sars. Loch Harray, frequent. 
Cyclops viridis, Jurine. Frequent in Loch Harray. 
»  e@guorus, Fischer. Frequent in Loch Stenness. 
OsTRACODA. 
Cypria serena (Koch). Loch Harray, generally distributed. 
5, levis (O. F. Miller). Loch Harray, not so common as the last. 
»,  Oophthalmica (Jurine). Loch Harray, frequent. 
Cypris prasina, Fischer. Loch Harray, near Bridge of Brogar. 
Erpetocypris reptans (Baird). Loch Harray, upper end. 
Cypridopsis villosa (Jurine). Loch Harray, generally distributed. 
Potamocypris fulva, Brady. Loch Harray, lower end. 
Candona candida (Miiller). Loch Harray, generally distributed. 
Candona lactea, Baird. Loch Harray, upper end. Bs 
me pubescens (Koch). Loch Hariay, generally distributed. 
bs hyalina, B. and R. Loch Harray, rare, but generally distributed. 
3 kingsleti, B. and R. Loch Harray, rare, upper end. 
Ilyocypris gibba (Ramdohr). Loch Harray, frequent, generally distributed. 
Limnicythere inopinata (Baird). Loch Harray, generally distributed, but not 
very common, 
Cytheridea torosa (Jones). Loch Stenness, common ; Loch Harray, lower end. 
Cythere pellucida, Baird. Loch Stenness, frequent. 
»,  confusa, B. and N. Loch Stenness, frequent. 
»,  gtbbosa, Brady and Robertson. Loch Stenness, rare. 
Cytherura nigrescens (Baird). Loch Stenness, frequent. 
3 gibba (Miller). Loch Stenness, rare. 
CLADOCERA. 
Daphnia pulex. Loch Harray, very abundant. 
PROTOZOA. 
FORAMINIFERA. 
Miliolina agglutinans. Loch Stenness, not common. 
i subrotunda. Loch Stenness, not common. 
Truncatulina lobatula. Loch Stenness, not common. 
Polystomella umbilicatula. Loch Stenness, not common. 
Nonionina depressula. Loch Stenness, not common, 
