904 THE VOYAGE OF H.M.S. CHALLENGER. 



broad, but much broader at the base ; the inner plates seemingly adnate, their inner 

 margins marked by a line of backward-pointing cilia ; the mandibular processes small, 

 with rounded apices. 



First Maxillse. — Inner plate small, with five plumose setae at and near the apex ; 

 outer plate broad, with eleven slender denticulate spines on the truncate distal border, 

 the lateral denticles numbering from two to six, all except the outermost of the shorter 

 spines having at least four ; the palp broad, its long second joint reaching beyond the 

 outer plate, the truncate margin fringed in one of the maxillse with five short teeth and 

 a spine, in the other maxilla with six spine-teeth and a spine : in both there are four 

 spine-like setas rising on the surface just within the distal margin. 



Second Maxilla?. — Inner plate a little broader and shorter than the outer, the spines 

 running round the apex and about halfway down the inner margin, at which point are 

 five plumose setae, the lowest small, the two uppermost large and long ; the spines of 

 the outer plate, which are as usual longer than those of the inner, do not descend 

 the inner margin. 



Maxillipeds. — The prismatic inner plates rather long, but not nearly reaching as far 

 as the distal end of the first joint of the palp, with several plumose setse on the inner 

 margin, which pass round towards the outer apex, at that part being short and incurved ; 

 the truncate distal margin has three small teeth ; the outer plates not reaching far 

 beyond the first joint of the palp ; the inner margin smooth, but the surface at a little 

 distance within it set closely with longer and shorter spine-like setse, which are continued 

 round the apical margin, being there setiform and plumose ; the outermost but one is the 

 longest, the outermost being abruptly much shorter ; the first joint of the palp is longer 

 than the third ; the second longer than either, very broad, its length not twice its own 

 breadth, fringed on the inner margin with numerous setae, of which it has groups about 

 the distal margin and on the outer surface near the inner margin; the third joint bending 

 inwards, with numerous groups of setae or spines on the inner surface and round the 

 finger; the finger shorter than the third joint, its inner margin nearly straight, armed 

 with a row of five setules ; the nail a little curved, almost spine-like. 



First Gnathopods. — Front margin of side-plate short, convex ; lower margin a little 

 concave, carrying some microscopic spinules, forming a rounded angle with the hinder 

 margin, the whole plate very small. First joint of the limb reaching much beyond the 

 side-plate, front margin almost straight, with a small lobe of the outer surface within its 

 distal angle, the hind margin bent above the centre, and at the bend carrying a group of 

 four long seta?, and another group on the inner surface near these ; second joint short, 

 like the preceding distally fringed on the lower inner margin at the back with spines of 

 various lengths ; third joint almost triangular, hind margin irregular, inner surface with 

 four groups of spines, the largest near the acute apex ; the wrist nearly as long as the 

 first joint, widening distally, fringed with groups of spines round the serrate hind margin, 



