Land and Fresh-Water Crustacea around Edinburgh. 69 
through the plants and alge in the shallow water at the 
head of the loch. It has been obtained, more recently, in 
material, collected by hand-net, from a ditch in the neigh- 
bourhood of Harelaw Dam, Balerno, near Edinburgh, and 
also in Duddingston Loch. 
Equally interesting is the distribution of Diaptomus serri- 
cornis, Lilljeborg. This species was not known to be a 
member of the British fauna till it was discovered in tow- 
net gatherings from Loch Mullach, Corrie, Sutherlandshire, 
collected by Mr W. S. Caine.! After its discovery in this 
loch, it was ascertained that Mr David Robertson had taken 
the same species in a pond, near Lerwick, in 1867, but it had 
remained since that time unnoticed in print. At present the 
only known British habitats for Diaptomus serricornis are the 
two places here mentioned. It occurs “in fresh-water lakes 
at Lumbowski in Russian Lapland,” and this, so far, is the 
only European district where it has been obtained, unless 
Diaptomus wierzejskvi, Richard, be held as being merely a 
local variety of Diaptomus serricornis (and really the difference 
between these two forms seems to be so very small that they 
can hardly be considered as specifically distinct). Diaptomus 
wrerzejskit has been recorded from Spain (neighbourhoods of 
Madrid and Valladolid) and from Saxony. If, therefore, we 
are to consider these two forms as belonging to the one 
species, its known distribution is thus of considerable 
extent, and may indicate. that, though it is only recorded 
from a few localities, it will yet be found of more frequent 
occurrence than is apparent at present. 
The following lists of Copepoda from a few of the principal 
places within the district, will help to show how this group 
is locally distributed, and how different species are associated 
together. These local lists are not to be considered exhaustive, 
but simply as an effort to bring together the species that 
have been obtained in the various localities, and thus far 
satisfactorily determined. The first list will be that of the 
species obtained in the loch at Duddingston—a loch that has 
1 See Scottish. Naturalist for October 1891, p. 172; also A Revision of 
the British Species of Fresh-Water Cyclopide and Calanidx, by Professor 
Brady, p. 36 (1891). 
