362 Proceedings of the Royal Physical Society. 
XXX. The Land and Fresh-Water Crustacea of the- District 
around Edinburgh. Part III.—The Cladocera. By 
THomAS Scort, F.L.S. 
(Read 18th April 1894.) 
In my two previous communications on the land and fresh- 
water Crustacea of the district around Edinburgh, I gave an 
account of the Amphipoda and Isopoda, and of the Ostracoda 
and Copepoda, that had been observed within the prescribed 
area. In the present paper I propose to deal with the Cladocera. 
Unfortunately, I have not been able to devote so much time to 
the study of this curious and troublesome, but very interest- 
ing, group of the Crustacea as it was my desire to do. It may 
therefore be necessary, later on, to prepare a supplementary 
paper, for the purpose of recording species belonging to the 
various groups that may yet be discovered in the district as 
the result of more extensive and careful investigation. It is 
scarcely possible that the lists I have prepared can be 
exhaustive, seeing that, comparatively, only a small portion 
of the district has been examined. 
Two orders of the Crustacea—the PayLLopopa and the 
BRANCHIURA—are not yet, so far as I know, represented in 
the district around Edinburgh. I, at one time, thought that 
Artemia saline (the Brine Shrimp)—one of the Phyllopods— 
might be obtained within the district, where “salt-pans,” 
past or present, existed; but after inquiring in various direc- 
tions, no trace of this strange organism has been discovered. 
Apus cancriformis—another member of the Phyllopoda—is 
also absent from our district. Both Apus and Artemia are 
included in the British fauna. Though Apus is not now 
known to occur anywhere within the area around Edin- 
burgh, or even in Scotland, the interesting discoveries of Mr 
James Bennie, of the Geological Survey, have shown that in 
ages long ago Apus* was a common Crustacean-in what is now 
the neighbourhood of Edinburgh. Since there is, therefore, 
’ no doubt that Apus was common in our district sometime 
1 See Mr Bennie’s paper in the Annals of Scottish Natural History, No. 9 
(1894), p. 46. 
