313 



and lateral processes being simple, the sub-dorsal bifurcate, except in the last seg- 

 ment. Urosome, including the caudal rami. almost as long as the anterior division 

 and without any dorsal processes, but with 3 successive pairs of simple lateral 

 and sub-dorsal processes of considerable length and curving abruptly backwards. 

 All the processes minutely denticulate in their outer part. Last caudal segment 

 rather small, with the anal opercle smooth. Caudal rami considerably produced, 

 exceeding half the length of the urosome, and very narrow, each exhibiting at about 

 the middle of the outer edge a slender bristle, middle apical seta exceeding 

 half the length of the body. Anterior antennae rather slender, being fully as long 

 as the cephalic segment, 2nd joint slightly exceeding the 1st in length, but much 

 narrower and (in some specimens) provided near the base posteriorly with a short 

 incurved dentiform projection; terminal joint shorter than the 2nd, and linear in 

 form. Posterior antenna? with the distal joint longer than the proximal one, the 

 latter carrying 2 small seta? anteriorly. Posterior maxillipeds very slender, hand 

 sublinear in form, dactvlus long and setiform. 1st pair of legs with the inner 

 ramus nearly twice as long as the outer, distal joint scarcely more than l '/ : . as 

 long as the proximal one, and carrying on the tip 2 slender seta?, and inside them a 

 small spine; distal joint of outer ramus armed with 3 slender spines and 2 

 geniculate setee. Inner ramus of the 3 succeeding pairs scarcely half as long as 

 the outer, and narrow linear in form, carrying on the tip 2 or 3 slender seta?; 

 outer ramus with the spines of the outer edge very long and slender, terminal 

 joint without any seta? inside. Last pair of legs with the distal joint linear in 

 form, and edged with 5 setae, 2 on the outer edge, 2 on the tip, and 1 on the 

 inner edge, inner apical seta much the longest; proximal joint with the digitiform 

 process exceedingly long and slender, inner expansion about half the length of 

 the distal joint and rather narrow, carrying 4 seta? of moderate length. Ovisac 

 broadly rounded and somewhat flattened. 



Male, as usual, smaller than female, and with the anterior antenna? 

 distinctly hinged, 5-articulate, 3rd joint slightly dilated, last joint claw-like. In- 

 ner ramus of 2nd pair of legs armed at the tip, with a somewhat flexuous claw- 

 like spine in addition to the seta?. Last pair of legs much smaller than in female, 

 one of the setae wanting on the outer edge of the distal joint, proximal joint 

 without any expansion inside. 



Colour whitish grey. 



Length of adult female 0.78 mm. 



Remarks. This form was described, but not figured, by Norman, from 

 specimens collected off the Finmark coast, and its resemblance to the species 



42 Crustacea. 



