tg00-1901.] Prize Collection of Fresh-water Crustacea. 2 55 
The following is the list of crustacea collected, with a note 
‘thereon by the adjudicator :— 
LIST OF FRESH-WATER CRUSTACEA 
CoLLEcTED IN Mip-Loruian IN THE Years 1900 anv 1901, anD Mounrep 
AS Microscopic Oxpsucts py DR AND Miss SPRAGUE; AND FOR WHICH 
4 THE Socrety’s Prizm, VaLur £5, was AWARDED ON 23RD OcTOBER 
1901. 
(The numbers refer to the slides. ) 
AMPHIPODA. 
Gammarus. 
1, G. pulex, Penn. - 
Cobbinshaw Reservoir, June 22, 1900. Very common, Has been 
met with most plentifully in running water. 
Isopopa. 
- Asellus. 
2, A. aquaticus, Linn. 
Marchfield Pond, July 7, 1900. Very common. 
CoPEropa. 
Diaptomus. 
3, 4, 5, D. gracilis, G. O. Sars. 
Ravelston Quarry, Aug. 2, 1900. Bavelaw Burn, June 28, 1900. 
The colour of this creature was bluish, and the ends, but not the 
tips, of the antennez red. This species is common in clear water, 
and where it occurs is often very plentiful, especially in sunny weather. 
It varies considerably in size and colour. 
Cyclops. 
6, 7, C. strenuus, Fischer. 
Marchfield Pond, June 17, 1900. Very common. Easily recognised 
by the long and divergent stylets of the furca and short tail-bristles. 
8, C. bicuspidatus, Claus. 
Quarry in Corstorphine Wood, Jan. 13, 1901. Common. Most 
easily recognised from the shape of the receptacle (receptaculum 
seminis), and by the numerous minute dots on the furca and other 
parts. Schmeil calls them cup-shaped depressions. 
9, C. languidus, G. O. Sars. 
Pond near Tynehead, March 30, 1901. Uncommon. Seems to 
prefer high ground. Best recognised by the 16-jointed antenne, 
10, C. vernalis, Fischer, 
Pond on west side of Bonaly golf-course, Jan. 2, 1901. Common. 
Requires some care to distinguish it from C. bicuspidatus or a small C. 
viridis. Most readily distinguished by the fifth foot and the form of 
the receptacle. 
11, C. bisetosus, Rehberg. 
Pond on House-of-Hill Farm, Aug. 21,1900. Uncommon. Some- 
times almost undistinguishable from C. bicuspidatus except by its 
smaller size. 
12, C. viridis, Jurine. 
4 Granton Quarry, July 14, 1900. Very common. Distinguished by 
its very large size and the form of the fifth foot. 
