43 



Remarks. The present species is closely allied to B. typica and about 

 of same size, but of somewhat more robust form of the body, and more parti- 

 cularly distinguished by the shape of the last pair of legs and the rather different 

 mutual relation of the setae attached to the distal joint of that pair. According to 

 the figures of these legs given by Brady and Scott, it would seem that the British 

 form recorded as B. typica Boeck is more properly referable to the present species. 



Occurrence. Specimens of this form have been obtained at Ris0r 

 together with the typical species, and it is very probable that on a closer 

 investigation it also will be found to occur in many other places on the 

 Norwegian coast. 



33. Bradya macrochaeta, G. O. Sars, n. sp. 



(PI. XXVII, fig. 1). 



Specific Characters. Female. Body exhibiting the usual somewhat 

 obpyriform shape, the anterior division being considerably broader than the 

 posterior, with the greatest width somewhat in front of the middle. Cephalic 

 segment comparatively large, exceeding in length the exposed part of the 

 trunk, and only slightly contracted in front; rostral plate strongly deflexed. 

 Epimeral plates of the 3 succeeding segments bluntly angular behind. Uro- 

 some but little exceeding half the length of the anterior division, and gradu- 

 ally tapered behind; genital segment fully as large as the 2 succeeding seg- 

 ments combined; anal segment, as usual, the smallest and slightly incised 

 behind in the middle. Caudal rami about the length of the anal segment and 

 somewhat divergent; apical setae very slender. Antennae, oral parts, and 

 natatory legs of quite normal structure. Last pair of legs, however, distinguished 

 by the excessive length of the marginal setae, some of them extending almost 

 to the end of the tail; distal joint of those legs comparatively small, with the 

 middle seta the longest; inner expansion of proximal joint not much produced, 

 but with the apical setae very slender and elongated, the inner one nearly 

 attaining the length of the middle seta of the distal joint. 



Colour pale whitish grey. 



Length of adult female 0.60 mm. 



Remarks. The present species is of much smaller size than the pre- 

 ceding one, and may moreover at once be distinguished both from this and 

 the other known species by the excessive length of the setae clothing the last 

 pair of legs, a character which indeed has given rise to the specific name here 

 proposed. 



