89 



rather expanded below, 4th pair deeply emarginated posteriorly and forming 

 below the emargination a sharp corner, 5th pair comparatively small and 

 more broad than deep. Last pair of epimeral plates of metasome with the 

 terminal lobe sharply pointed. First segment of nrosome scarcely impivs-.-d 

 dorsally. Eyes lageniform, distinctly constricted at the middle and consider- 

 ably dilated below, in male much larger than in female; pigment in both sexes 

 very dark, black. Superior antennae in female about the length of the eepha- 

 lon and the 2 first segments of mesosome combined, 1st joint of the peduncle, 

 very large; flagellum somewhat longer than the peduncle and composed of 

 about 15 joints, the 1st of which is about as long as the 5 succeeding ones 

 combined; accessory appendage more than half the length of the flagellum 

 and 8-articulate, 1st joint the largest. Inferior antennae considerably longer 

 than the superior, antepenultimate joint of the peduncle rather thick and 

 scarcely shorter than the penultimate; flagellum slender and composed of 

 about 23 articulations. Anterior gnathopoda strong, propodos longer than the 

 carpus l and nearly of uniform breadth throughout, palmar edge transversal 

 and defined below by a right-angled corner. Posterior gnathopoda with the 

 propodos about half the length of the carpus and oval in form. The 2 post- 

 erior pairs of pereiopoda nearly equal in length and considerably longer than 

 the 3rd pair. Last pair of uropoda with the inner ramus somewhat longer 

 than the basal joint of the outer; both rami in male larger than in female. 

 Telson oblong quadrangular, only slightly tapering distally, with 2 pairs of 

 dorsal denticles; cleft extending beyond the middle, and somewhat widening 

 below; terminal lobes obtuse at the tip, forming exteriorly a projecting angle 

 inside which occurs a small denticle. Colour (in Norwegian specimens) whitish, 

 each segment exhibiting dorsally a transversal yellowish band. Usual length 

 of adult female 18 mm.; maximum length of arctic specimens 40 mm. 



Bemarks. - There cannot, I think, be any doubt that the Cancer nu- 

 yax of Phipps is the present species, and as that name is much elder than 

 any of the specific appellations proposed by Kroyer, it ought certainly to be 

 retained for the species under consideration. Arctic specimens would seem to 

 differ from those met with off the Norwegian coast, not only by their much 

 larger size and by the above mentioned somewhat different proportion between 

 the carpus and propodos of the anterior gnathopoda, but also by the colour, which. 

 according to a coloured drawing made during the Norwegian North Atlantic 

 Expedition, is a light claret-red. 



Occurrence. The species would seem to occur along the whole coast 



1 In arctic specimens the carpus appears generally larger, being often as long as the pro- 

 podos and much broader. 



