Land and Fresh-Water Crustacea around Edinburgh. 51 
more interesting, because rare forms turn up in such unlikely 
and exceptional localities, that the expectation is kept 
always, more or less, active and on the alert. 
The Ostracoda, which may thus form a suitable subject 
for a leisure-time study, are not only of interest to the natu- 
ralist, but are also of value from a merely utilitarian point 
of view, seeing that fish are not indifferent to them as an 
article of food; hence, it is the experience of the student 
that limited localities frequented by the trout and the 
stickleback are not, commonly, the best hunting-grounds for 
Ostracoda. Another point worth noticing is the dissimilarity 
of species between the east and the west sides of Scotland. 
Though a considerable amount of attention has been devoted 
to the Ostracoda for many years, the difference in this 
respect remains fairly constant. No doubt, the difference 
has varied during the course of these years,—species that 
appeared to be confined to one side have been discovered on 
the other; but, while there was this tendency to equalisa- 
tion, the research which led to it also brought to light other 
forms, and these, being, for the present, at least, apparently 
confined to the east or the west sides, cause the difference 
still to remain. The species that are at present apparently 
confined to the east or the west of Scotland are few in 
number, and may be best shown in tabulated form, thus: 
TABLE [. 
Species found on the east side of | Species found on the west side of 
Scotland, but not hitherto on Scotland, but not hitherto on 
the west side. the east side. 
Cypris pubera, O. F, Miiller, Scottia browniana? (T. R, Jones). 
Erpetocypris violacea, Brady and | Erpetocypris robertsont, Brady and 
Norman, Norman. 
Cypridopsis newtont, Brady and 
Robertson. 
Cypridopsis variegata, Brady and 
Norman. 
Darwinula stevensoni,) Brady and 
Robertson. 
1 Scottia browniana has been obtained common in a post-Tertiary deposit at 
Elie in Fifeshire (see Proc. Roy. Phys. Soc. Edin, vol. x., p. 334), and 
Darwinula stevensoni from a somewhat similar deposit at the Meadows, 
Edinburgh (see Proc, Roy. Phys, Soc. Edin., vol. x., p- 141). 
