262 Messrs. J. Wood-Mason and A. Alcock on 



margin straight, entire — being only obsoletely bilobed — 

 divided from the supra-orbital margin on each side by a slight 

 notch for the reception of the first joint of the flagellum of 

 the antennas. Supra-orbital margin with one fissure, infra- 

 orbital entire. Antero-lateral margins shorter than the 

 postero-lateral, arched, armed with three teeth, including the 

 extra-orbital angle. Branchial regions swollen, separated 

 from the gastric by a V-shaped impression, from the cardiac 

 by their own prominence, and by a slight transverse depres- 

 sion from tJie hepatic, which is separated from the gastric in 

 a similar manner. Afferent and efferent branchial apertures 

 large ; the outer w'all of the large efTerent canal forms a sub- 

 carinated elevation of the anterior pleural region. Chelipeds 

 large, smooth, with a strong groove near the lower margin of 

 the produced portion of the propodite on the outside ; the 

 upper margin of the propodite subcarinate ; the carpopodite 

 smooth, subquadrate, with a small spine at the inner angle ; 

 and the meropodite with a short sliarp spine near the apex of 

 its posterior angle. Ambulatory legs rather weak, the first 

 three pairs subequal, the last shorter, with the meropodite 

 curved in correspondence with the convexity of the branchial 

 regions of the carapace ; the dactylopodites are compressed- 

 sty llform, with a groove on each side and a slight fringe of 

 seta3 on the upper and lower margins, those of the last pair 

 being, like their propoditcs, shorter and broader and fringed, 

 especially below, with longer setse ; the ambulatory legs in 

 fact are subnatatory, and agree in structure with those of the 

 Portunidai. Integument everywhere polished and glabrous, 

 exce])t for the presence of a few scattered sette on the dorsal 

 surface of tlie legs and for the dactylopoditic fringes. 



In life this crab was of a beautiful deep-sea pink, with a 

 dotted, V-shaped, white mark between the gastric and bran- 

 chial regions. 



One specimen was obtained at Station 96, 98 to 102 

 fathoms; the length of its carapace is 21*4 millim., and the 

 greatest breadth between the points of the third teeth 29 

 millim. 



The following species is referred provisionally to the same 

 genus, though it differs in having the first tooth of the antero- 

 lateral margin distinct from the orbit, and the legs, especially 

 the last pair, not nearly so distinctly natatory. 



43. Nectopanope longipes, sp. n., Wood-Mason. 

 Differs from the preceding in its branchial regions not 



