36 



contracted in front; rostral plate rather prominent and, seen from above, 

 narrowly truncated at the end. Urosome about equalling in length 2 .'.; of the 

 anterior division, and gradually tapered behind; genital segment much larger 

 than the succeeding one; anal segment, as usual, the smallest and very slightly 

 incised behind in the middle. Caudal rami comparatively short, being scarcely 

 longer than they are broad; apical setae rather slender and elongated. Anterior 

 antennae of moderate size and 6-articulate. Posterior antennae with the outer 

 ramus nearly as long as the inner and biarticulate, 1st joint very small, distal 

 joint somewhat curved and provided inside with a row of slender spinules. 

 Oral parts and natatory legs of the usual structure. Last pair of legs com- 

 paratively short, with the distal joint broadly quadrangular in form and having 

 the terminal lobes densely spinulose and nearly equal, marginal setae unusu- 

 ally short; appendicular bristle attached close to the base of the joint and 

 accompanied inside by 4 small spinules; inner expansion of proximal joint 

 extending almost as far as the distal joint, and provided across the middle 

 with a row of delicate spinules, inner edge coarsely ciliated, apical setae, as 

 usual, rather unequal in length. 



Colour of the living animal not yet ascertained. 



Length of adult female 0.63 mm. 



Remarks. This is a much smaller species than any of the 3 preceding 



* 



ones, and is moreover easily distinguished by the shape of the rostral plate 

 and the structure of the last pair of legs. The specific name here proposed 

 alludes to the very thin and pellucid integuments and the comparatively slender 

 form of the body. 



Occurrence. Some few specimens of this form, all of the female sex, 

 were picked up from samples taken partly at Riser, partly at Korshavn, the 

 depth ranging from 20 to 60 fathoms. 



27. Pseudobradya parvula, G. O. Sars, n. sp. 



(PI. XXIII, fig. 2). 



Specific Characters. Female. Body comparatively short and stout, 

 with the anterior division'somewhat dilated in the middle. Cephalic segment 

 occupying about half the length of that division, and abruptly contracted in 

 Iront; rostral plate less prominent than in the preceding species and, seen 

 from above, obtusely truncated at the end. Urosome only slightly exceeding 

 in length the exposed part of the trunk and not much narrowed behind; 

 genital segment, as usual, the largest and nearly equalling in lengt the 2 sue- 



