362 DK. H. J. HANSEN ON THE 



Peduncle of antennae with the penultimate joint conspicuously 

 more than half as long as the terminal one. 



Epimera of second to fourth thoracic segment produced in 

 quite rudimentary or very small processes ; epimera of fifth 

 segment "with the process a little longer, those of the two 

 posterior segments produced into moderately short processes 

 nearly equal in size. 



Seventh thoracic legs slender ; fourth joint considerably longer 

 than broad and a little shorter than the fifth ; fourth and fifth 

 joints without spines or setse on the lower surface, the margins 

 themselves excepted. 



Last abdominal segment has on the upper surface a deep 

 transversely oval impression at most one-third as broad as the 

 segment, and besides sometimes at each end of this central 

 excavation, and touching it, a feeble sublateral impression. 

 Hind margin nearly straight or slightly convex, at least half as 

 long as the breadth of the segment, without movable spines, but 

 at each end limited by a very conspicuous triangular tooth. 



Uropoda proportionately considerably larger in the male than 

 in the female, but their natatory setse are 1 onger in the female 

 than in the male. The endopod, when parallel with the axis of 

 the animal, reaches a little beyond the abdomen. 



Length of the male 5-7 mm., of the female 7-8*5 mm. 



Occurrence. — I have seen specimens from lat. 56° IN"., long. 

 18° W., and off South-western Iceland, lat. 63° 21' N., long. 

 25° 21' W. ; furthermore from the sea from these two places to 

 the most northern part of Scotland, and especially to and around 

 the Faroe Islands : in this area it has been captured twelve 

 times, always distant from the coast, and probably always 

 pelagic, though in a few instances it was taken in the dredge or 

 the trawl. According to A. 0. "Walker (Trans. Liverp. Biol. Soc 

 xii. p. 165) it has been secured on the west coast ot Ireland, at 

 Outer Harbour, Killiebegs, Co. Donegal, 14-16 fathoms. In 

 material received from Canon Norman 1 found a single specimen 

 from the 'Porcupine' Expedition: St. 29, off Cadiz, Spain, 

 227 fathoms. Bollfus records it from the Azores : "Au large 

 de Porta Delgada, ile San Miquel, . . . surface." 



Itemarhs. — The species is easily distinguished from all other 

 European forms by having the transverse hind margin of the 

 abdomen long, without movable spines, but limited at each end 

 by a conspicuous triangular tooth; antennulse, epimera, &c. afford 



