8 Distribution of the Smaller Crustacea. [Sess. 
Island. The specimens, however, were captured in February 
1889, but at that time, as the species was unknown to me, I 
hesitated to record it. The same species was taken for the 
second time in Scottish waters by Mr F. G. Pearcey on Jan. 10, 
1901. Specimens were captured by tow-net in the Cromarty 
Firth at a depth of about 74 fathoms; and it is of interest 
to note that on both occasions the species was obtained so 
early in the year. The Rev. A. M. Norman, in his revision of - 
the British Amphipoda (‘Annals and Magazine of Natural 
History,’ ser. 7, vol. v., February 1900), has some interesting 
remarks on this species. My largest Scottish specimen 
measures about four-fifths of an inch in length, but Arctic 
Specimens attain to over one and a half inch in length 
(40-43 millimetres). : 
Having thus given several examples of crustacean species 
whose distribution appears to be directly or indirectly influ- : 
enced by seasonal changes and by oceanic currents, | now proceed, 
thirdly, to mention a number of species whose distribution is 
somewhat peculiar, and for which there is, so far, no satisfac- 
tory explanation. Some of the best examples of this kind of 
distribution are to be met with amongst parasitic species, but 
I shall first refer to one or two free-living forms which, in 
this respect, are not without interest. The first I shall 
mention is the marine ostracod Conchecia elegans. We owe 
the addition of this species to the British fauna to the 
researches of Sir John Murray, who, a number of years ago, 
found it abundantly in Loch Etive, near Oban, at a depth of 
50 fathoms, and it is still common in the deeper parts of that 
loch. But though Conchecia elegans is so common in this 
particular loch, it has been rarely met with anywhere else in 
the British seas,—indeed, I know of only two other records: 
one specimen was dredged in deep water 180 miles north-east 
of Buchan Ness on May 22, 1901; and another was obtained 
from the stomach of a whiting captured at a depth of 65 
fathoms about ten miles off Aberdeen a few days previous to 
the one last mentioned. Professor G. O. Sars of Christiania 
describes the species as very abundant among the Lofoten 
Islands down to 300 fathoms. 
The next species I shall notice is the fine large copepod, 
