34 



about equalling in length 3 /4 of the anterior division, and only slightly tapered 

 behind, its segments successively diminishing in size and, like the trunkal segments, 

 provided, in addition to the usual spinulation of the hind edge, with a trans- 

 verse row of small spinules across the middle of the back. Caudal rami com- 

 paratively short, scarcely longer than they are broad at the base; apical setae 

 not much elongated. Anterior antennae very small, 6-articulate. Posterior 

 antennae with the outer ramus rather slender, extending almost as far as the 

 inner, and 3-articulate, the first 2 joints very small. Oral parts of normal 

 structure. Natatory legs comparatively slender, with the rami somewhat unequal 

 in length; the inner one being in 1st pair longer than the outer, in the suc- 

 ceeding pairs rather shorter; middle joint of this ramus in 3rd pair with 2 

 well-developed setae inside. Last pair of legs somewhat resembling in shape 

 those in P. digitata, the distal joint being rather large and spatulate in form, 

 though having the surface nearly smooth and the terminal lobes less sharply 

 marked off from each other, innermost marginal seta very slender and longer 

 than the other 2, which are nearly equal; appendicular bristle well developed 

 and attached close to the base of the joint; inner expansion of proximal joint 

 extending nearly to the middle of the distal joint, apical setae rather unequal, 

 the outer one the shorter and spiniform. 



Colour of the living animal not yet ascertained. 



Length of adult female 0.75 mm. 



Remarks. The present species may be easily distinguished from the 

 2 preceding ones by the somewhat less slender form of the body and by the 

 rather conspicuous spinulose armature of the segments, giving the body a 

 somewhat scabrous appearance; hence the specific name here proposed. More- 

 over some well-marked differences are found in the structure of some of the 

 appendages, as pointed out in the above diagnosis. 



Occurrence. Two female specimens only of this form have as yet 

 come under my notice. They were found in a sample taken at Riser in about 

 the same place, where the 2 preceding species occurred. 



25. Pseudobradya attenuata, G. O. Sars, n. sp. 



(PI. XXII). 



Specific Caracters. Female. Body very slender, elongate subfusiform in 

 shape, being conspicuously attenuated both in front and behind. Cephalic segment 

 occupying about half the length of the anterior division and rapidly narrowed in 

 front; rostral plate somewhat prominent and obtusely acuminate at the end. 



