260 Prize Collection of Fresh-water Crustacea. [Sess. q 
NoTE ON THE FOREGOING LIST. 
By Mr Tuomas Scort, F.LS. 
The specimens are carefully and very neatly mounted, and 
a few of the characters which serve to distinguish the species 
are in general fairly well shown. But it would have added 
to the value of the collection had there been separate prepara- 
tions of at least a few of the more important appendages, as it 
is only in this way that the specific characters of many of the 
species, especially of the Copepoda, can be correctly exhibited. 
The list will form an interesting addition to the litera- 
ture on the crustacean fauna of the county of Mid-Lothian. 
The discovery of such species as Cyclops nanus, Macrothria 
laticornis, and Alonella rostrata is of much interest, and is 
an indication that further research may lead to further 
discoveries. 
No. 18, Cyclops nanus, was added to the British fauna 
by the writer of this note in 1899, but not figured by 
him (see 17th Annual Report of the Fishery Board for 
Scotland, pp. 172-182). © languidus was also, about the 
same time, added by him to the Scottish fauna. 
No. 40. This species has frequently been referred to 
Diaphanosoma brachyurum, Liévin; but Lilljeborg, in his 
recently published work, places it doubtfully under Diaph- 
anosoma Leuchtenbergianum, Fischer. Should it turn out to 
be really identical with Fischer’s species, Baird’s name, being 
the older, will have to be restored: in that case the name ~ 
would be Diaphanosoma Wingii, Baird. 
No. 42. This looks very like C. rotunda, G. O. Sars. 
Nos. 47 and 48. Prof. Lilljeborg, in his great work lately 
published, ascribes both these species to Daphnia hyalina, — 
Leydig. But these so-called species of Daphnia are so ex- 
ceedingly liable to variation, that only a lengthened study 
of them can enable one to come to anything like a satis- 
factory decision about them. In these circumstances I 
give Lilljeborg’s finding, without venturing an opinion as 
to whether it is right or wrong. 
Nos. 49 and 50. I have scarcely any doubt that these are — 
immature specimens of No. 48. The crest on the back of 
Daphnia is not of much value as a specific character. 
ay 
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