On some Entomostraca from Castlemilk, near Ruther- 
glen. By Tuomas Scort, F.L.S., Naturalist to the Fishery 
Board for Scotland. 
[Read 28th November, 1893. ] 
THE little loch from which the Entomostraca now to be recorded 
were obtained is situated on the hillside above the Ancient and 
Royal Burgh of Rutherglen, on the estate of Castlemilk, and 
- immediately below the mansion-house of that name. It is fed 
by a small stream which rises on the Cathkin Hills. The 
loch is apparently artificial, but judging from its appearance and 
surroundings, it seems to have been in existence for a considerable 
period. Whatever may have been its origin or the date of its 
formation, the loch evidently contains a fairly rich Entomostracan 
fauna. The material collected by Mr. James Steel, and which he 
kindly handed over to me for examination, was contained in a 
small bottle ; but although the quantity was small, it has yielded 
no fewer than eighteen species representing fifteen genera, and 
comprising five species of Ostracoda, six of Copepoda, and seven 
of Cladocera. The following is a list of the species obtained :— 
THE OSTRACODA. 
The Ostracoda, whose outside covering so closely resembles in 
miniature the shell of the bivalve molluscan shell-fish, are found 
not only in the sea but more or less frequently in nearly all fresh 
waters, with the exception, perhaps, of streams and rivers that 
flow with a rapid current. Their favourite habitats are shallow 
weedy lakes, ponds, ditches, and such like localities. Some species 
occur almost everywhere, wherever such localities exist, while 
others appear to be somewhat erratic in their distribution, and 
are sometimes obtained in places that differ much in regard to 
the quality of the water. The particular grouping of species in 
each locality is, therefore, in itself a fairly interesting study. 
