Indian Deep-sea Drechjing. 171 



closely resemble those of the legs, differing therefrom only in 

 being somewhat stouter, more distinctly articulated, and more 

 richly provided with more strongly plumose setiu. 



Abdomen transversely rounded, not carinate, dorsally. 



Telson quadrangular, tapering gradually from base to apex, 

 terminating in a minute fixed median spine and two unequal 

 pairs of articulated lateral spines ; its dorsal spines obso- 

 lescent. 



There are twelve functional branchiaj and two epipodites 

 on each side distributed as follows in Psathrji-ocaris fraijilis'. — 



\ + -2eih+ 6 + o = U-\-2ep. 



Psathyrocaris has hence one more gill — and that a complete 

 podobranchia consisting of plume and epipod attached to the 

 second maxillipedes — than in Parapasiphae, the least modified 

 of the genera so far described, in which the corresponding gill 

 is reduced to a rudimentary epipod, 



57. Psathyrocaris fragilis^ sp. n. (Pis. X., XI.) 



Colour in spirit very dark reddish purple or wine-red above, 

 the ventral surface and legs ligiiter, the thoracic and abdo- 

 minal exopodites and antennje colourless. 



Thirteen specimens, all more or less broken, though admi- 

 rably preserved as to their soft tissues, were taken at Station 

 120, 240 fathoms. 



In dealing with a single species it is impossible satisfac- 

 torily to define the specific characters, and, as the results of 

 the dredgings carried out during the season 1891-92 contain 

 several additional species, including a fine ovigerous female 

 of one of them, we have thought it better to defer the specific 

 description of the present species until we shall have 

 thoroughly examined our new material. Meantime the 

 characters of the genus will suffice for those of the species, 

 especially as they are accompanied by detailed figures. 



12* 



