364 Mr. A. Scott on Scolecitlirix hibernica. 



are furnished with fewer setas, but bear a larger number of 

 " worm -hairs " than those of the female, Tlie fifth feet are 

 well developed and form a powerful grasping-organ ; they 

 consist of a large basal part armed with a comb-like row of 

 spines on its left surface and furnished distally witK two 

 elongate branches of nearly equal length and of a somewhat 

 complicated structure ; the right branch xa composed of two 

 joints, the first of which is long and of an irregular outline; 

 the second is considerably smaller and terminates in a finger- 

 and-thumb-like arrangement ; the left branch is apparently 

 four-jointed ; the second joint, which is slightly longer than 

 the first, is furnished on its outer distal margin with a 

 number of spine-like processes arranged in three tufts ; the 

 third and fourth joints are small, the fourth joint, which ends 

 somewhat abruptly, being furnished on its inner margin with 

 one moderately long and two short spines, and also with a 

 itw short spines on its surface. The drawing (PL XVIII. 

 fig. 7) shows the fifth feet of an immature male ; they differ 

 considerably from those of the mature form, as is frequently 

 the case among the Calanidse. Abdomen apparently five- 

 jointed ; first, second, third, and fourth joints subequal in 

 length, fifth very small. Caudal stylets scarcely so long as 

 the fourth segment ; length about equal to twice the breadth. 



Habitat. In deep water off the County Down coast, between 

 Uundrum and Dundalk Bays, Ireland; common. Also in 

 deep water in upper Loch Fyne and off the coast of Arran, 

 Scotland. 



Remarks. This species first became known to me from 

 specimens found in material collected in a tow-net attached 

 to the beam of a fish-trawl and worked close to the bottom of 

 the sea. The material was obtained by Mr. R. L. Ascroft, 

 one of the members of the Lancashire Sea-Fisheries Com- 

 mittee, when on board a trawler that was fishing in deep 

 water (21 to 29 fathoms) in the Irish Sea between the Isle 

 of Man and Ireland in the beginning of February last. 

 Some time afterwards my father, Mr. T. Scott, F.L.S., sent me 

 specimens of a Scolecitlirix wliich he had obtained in bottom 

 tow-net material collected in upper Loch Fyne and in the 

 Firth of Clyde in April last; these, on examination, proved 

 to be identical with those from the Irish Sea, and, as all the 

 specimens observed have been obtained in water of consider- 

 able depth and where the bottom consists of mud, this would 

 stem to indicate that it is really a deep-water species, and 

 may, perhaps, also explain why it has been so long over- 

 looked. 



Scohcithrix hibernica has been carefully compared with 



