1900-1 go1.] Prize Collection of Fresh-water Crustacea. 259 
Graptoleberis. 
56, G. testudinarius, Fischer. 
Elf Loch, Aug, 9, 1901. Rare. Easily recognised by the general 
form, well-marked reticulation, and the three or four teeth at the lower 
back corner of the shell. 
 Burycercus. 
57, E. lamellatus, Miiller. 
Duddingston Loch, Aug. 18, 1900. Rare. 
Alona. 
58, A. guttata, G. O. Sars. 
Elf Loch, June 1, 1901. Rare. Best recognised by the form of the 
post-abdomen. The small spots on the shell, from which the specific 
name is taken, are not always well marked. 
59, A. tenuicaudis, G. O. Sars. 
Duddingston Loch, Aug. 18, 1900. Rare. 
60, A. quadrangularis, Miiller. 
Duddingston Loch, June 21, 1901. Common. 
61, A. affinis, Leydig. 
North Esk Reservoir, May 18, 1901. Common. 
Alonella. 
62, A. rostrata, Koch. 
Cobbinshaw Reservoir, Aug. 13,1900. Rare. We have found only 
one specimen. 
63, A. exigua, Lilljeborg. 
Marfield Loch, April 9,1901. Rare. Easily recognised by the single 
conspicuous tooth at the lower back corner of the shell. 
64, A. nana, Baird. 
Marfield Loch, April 9,1901. Rare. Appears to like high ground. 
Acroperus. 
65, 66, A. harp, Baird. i 
ei Granton Quarry, July 26, 1900. Very common in summer. 
Alonopsis. 
67, 68, A. elongata, G. O. Sars. 
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Marfield Loch, May 25, 1901. Rare. 
' Pleuroxus. 
69, 70, P. trigonellus, Miiller. 
Marchfield Pond, June 21, 1901. Uncommon. 
J eracantha. 
71, P. truncata, Baird. 
High pond, Penicuik, Sept. 7, 1901. Rare. Found only on one 
occasion. 
Chydorus. 
_ 72, C. sphericus. 
Very common. During eighteen months the males were only 
observed in one gathering made on 3lst May 1901 at House-of-Hill 
pond. 
_ Note.—Nos. 22, 23, and 24 are excluded as being obtained from brackish 
water. No. 27 was excluded from this list as having been collected from 
a@ pond not available to other competitors: it has, however, been recorded 
from Duddingston Loch by Mr Thomas Scott, F.L.S. 
