12 EEV. T. E. E. STEBBING ON THE 



Lower lip. The outer and inner lobes have the margins well furred ; the mandibular 

 processes are divergent. 



First maxillce. The slender, slightly curved, inner plate has on the convex outer 

 margin and apex six plumose setse ; the outer plate has eleven spines on the truncate 

 di;-tal margin, some straight, some curved, all, except perhaps the outermost, more or 

 less serrate, or with a subapical tooth ; the palp not reaching so far as the outer plate's 

 apex, having at its base a little lobe of the trunk, the first joint rather broader and 

 longer than the second, which on the truncate apex carries three setse, the inner 

 serrate, the other two plumose. 



Second maxillce. Inner plate rather shorter than the outer, tending to oval in shape, 

 the apical end narrow, bordered with spines, plumose setse fringing both it and the 

 distal half of the inner margin ; the outer plate with parallel sides, only the truncate 

 distal margin occupied with spines. 



Maxillipeds. The inner plates with three plumose setse on the inner margin, two or 

 three teeth and several plumose setse or spines on the truncate distal margin ; the outer 

 plates bordered with seven stout spines and seventeen plumose setse of various sizes ; the 

 spcond joint of the palp with the broad distal margin naked, the inner margin and 

 adjacent surface thickly fringed with setse ; the third joint pear-shaped, with a very narrow 

 neck, the broad distal half of the joint set about with groups of setas, and having the 

 short and narrow slightly furred terminal joint attached to the middle of its distal margin ; 

 at the narrowed apex of the fourth joint there are two setse and three or four very small 

 ones near the apex. 



First gnathopods. Side-plates not very narrow, the lower hinder angle forming a 

 well-produced rounded point, with a single spinule. Limb as in Urothoe marinus, but 

 with only seven spines in the spine-row adjoining the broad distal margin of the wrist, 

 and the hand oval. 



Second gnathopods. The narrow hand is slightly distinguished from that of other 

 species by the prominence of the small convex palm, and is about four fifths as long as 

 the wrist. 



First and second perceopods nearly as in Urothoe marinus, but the fourth joint has six 

 or seven spines, the fifth has nine or ten, and the finger has six or seven small tubercles, 

 which in the second pair are set very closely together. In the first pair the side-plates 

 have eight or nine spinules at the lower hind corner. The marsupial plates of the 

 female, here and apparently in the kindred species, long and slender, and when fully 

 developed having the distal half fringed with moderately long setse. 



Third perceopods. The hind rim of the side-plates almost completely smooth. The 

 limb distinguished from that of Urothoe brevicornis by having the fourth joint very 

 much broader than the third, this joint (although belonging to a smaller species) having 

 more numerous spines in the spine-rows, and also on its distal margin a great number 

 of very long densely plumose setag ; the fifth joint is broad, and the finger not gently 



