30 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 7 J fathoms; and it is of interest 

 to note that on both occasions the species was obtained so 

 early in the year. The Eev. 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, I 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 Conchoecia elcgaiis. 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 Conchoscia 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. 0. 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, 



