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in length Vs of the anterior division; genital segment remarkably dilated in its 

 anterior part, forming on each side a large wing-like expansion somewhat similar 

 in shape to the epimeral lappets of the trunk- segments. Caudal rami short, 

 being scarcely longer than they are broad ; outermost seta at some distance from the 

 apex and about the length of the innermost, the 2 median setae not much prolonged. 

 Anterior antennae not nearly attaining half the length of the cephalic segment, 

 and composed of only 8 joints, the 2nd much the longest, terminal joint scarcely 

 longer than the 2 preceding joints combined. Posterior antennae very small, with 

 the terminal joint somewhat longer than the penultimate one, middle apical seta 

 not much prolonged. Siphon rather coarse, extending about midway between 

 the insertion of the posterior maxillipeds and that of 1st pair of legs. Maxillae 

 with the inner lobe almost twice as long as the outer and narrowly exserted 

 distally, apical seta comparatively short, those of the outer lobe subequal in length. 

 Anterior maxillipeds remarkably powerful, with the dactylus exceedingly strong 

 and hamiformly curved at the tip, secondary spine very small. Posterior maxil- 

 lipeds likewise rather strongly built, and having the terminal claw of the dactylus 

 densely clothed with small denticles. 1st pair of legs, as usual, somewhat smaller 

 than the 2 succeeding ones, which are rather strongly built, with the 2nd basal 

 joint triangularly produced inside. 4th pair of legs with the outer ramus normal, 

 inner ramus, however, very imperfectly developed, forming a small incurved stem 

 composed of only 2 subequal joints, each carrying a single short seta. Free 

 joint of last pair of leg extremely minute and apparently only provided with a 

 single small bristle 



Colour not yet ascertained. 



Length of adult female about 2 mm. 



Male unknown. 



Remarks. This form may be readily recognised from the other members 

 of the present family by its very broad depressed body, and the greatly expanded 

 genital segment. Only the female sex is as yet known. 



Occurrence. Only 2 female specimens of this form have hitherto come 

 under my notice. They were taken, many years ago, at Hammerfest, western 

 Finmark, from a depth of about 20 fathoms. 



