50 MARSHALL : ON THE BRITISH SPECIES OF BUCCINUM, FUSUS, ETC. 



cannot work their trawl deeper than about loo f., and rarely at that. 

 On another occasion, from the same source, Mr. Simpson found a 

 living but immature specimen of another Fusus. different from any 

 species that I know. It is nearest to F. Jatericeufi, Moll, but differs 

 from that shell in being still more slender, with more compressed 

 whorls, no longitudinal ribs, and a bulbous apex. I am informed that 

 of late years several species of the Echinodermata have been brought into 

 Aberdeen, from the same fishing-grounds, which had only been previ- 

 ously dredged in the Shetland-Faroe Channel, and 1 have myself 

 described an Ailula ("*) from these fishing-grounds which, if not well 

 authenticated, might have been relegated to the Shetland- Faroe 

 Channel. In this connection I may add that a more recent discovery 

 of A. simpxoni in a Teredo-pierced piece of wood brings its habitat 

 into complete harmony with that of A. ar(ienfevs, Jeffr., from frigid 

 water in the Shetland-Faroe Channel. 



The results of the exploration of the Shetland-Faroe Channel by 

 various expeditions has of course brought the question of the limits of 

 the British area for Zoological purposes into urgent prominence, and 

 it is to be hoped that the British Association will soon take it in hand 

 and issue some authoritative Rules on the subject, as they have done 

 in the matter of the Rules of Priority and Nomenclature. This 

 boundary or zone must in any case t)e an arbitrary one, and for that 

 very reason individual opinion cannot be expected to carry any weight. 

 It is also the more necessary not only because some rather wild ideas 

 appear to be entertained as to what constitutes a British species or what 

 are the limits of the British seas, but more especially because steam- 

 trawlers are rapidly taking the place of the old sailing craft, and are 

 now working nearly all the year round up to Iceland and the Faroes, 

 bringing back with them various genera of marine animals ; while the 

 change from sailing to steam trawlers is still more accelerated owing to 

 the growing reluctance of fishermen to remain at sea more than from 

 Monday to Saturday ; they are all learning to appreciate their week-end 

 on shore, and, once enjoyed, cannot be induced to sacrifice that 

 privilege ; so that while steam-trawlers are easily manned, and can run 

 home when they like, there is a difficulty in shipping hands for the 

 sailing craft, who have to come home when they can. 



(4) Adutai^Myrina) simpsoni^ Marsh., Journ. Malac, i9co, vol. vii, p. 167, figs. .-3. 



