1038 THE VOYAGE OF H.M.S. CHALLENGER. 



densely ciliated ; the outer plate has the inner margin produced into an apical tooth ; 

 the truncate slightly convex distal margin carrying eleven spines, of which some, chiefly 

 the outer ones, have lateral denticles, while the inner ones have the two edges serrate ; 

 the outer apex of the joint which carries this plate has some small spines; the first joint of 

 the palp is quite short, the second reaches much beyond the outer plate, widening distally, 

 the distal margin cut into five teeth, beside which are planted five spine-teeth, the 

 outermost the longest, and six submarginal elongate spines. 



Second Maxillse. — The inner plate narrow, shorter and narrower than the outer, the 

 lower half of its inner margin densely ciliated, the upper half and apex fringed with 

 strongly plumose setae or spines ; the semicircular apex of the outer plate is fringed with 

 spines, four or five on its outer margin being plumose and more setiform ; low down on 

 the outer margin there are one or two small spines. 



Maxillipeds. — The basal joint is fringed with setae, many of them very long and 

 densely plumose. The inner plates are narrow, reaching beyond the first joint of the 

 palp, the distal margin serrate, sloping outwards, carrying three spine-teeth near the inner 

 apex, which are almost concealed from the inner view by a row of five or six long plumose 

 setae crossing the surface ; the outer plates large, reaching almost to the apex of the 

 second joint of the palp, the lower part of the inner margin smooth, with two or three small 

 spines upon or near it, the upper part strongly crenate and carrying six strong spine-teeth, 

 somewhat spoon-shaped in outline ; round the apical margin there are five longer spines, 

 the outermost being the narrowest ; the first joint of the palp is short, the second long, 

 the inner margin fringed with long spines; the third joint longer than the first, narrowest 

 at the base, the inner margin and apex fringed with spines, of which there are groups also 

 on the surface ; the spines on the inner margin appear to be plumosely pectinate in the 

 lower half ; the finger is small, little curved, with a rather long nail, near which on the 

 inner margin the finger has some four decurrent spinules or setules ; the dorsal cilium is 

 small, near the hinge. 



First Gnathopods. — Side-plates much wider below than above, the rounded lower 

 corner in front being produced over the basal joints of the lower antennae, the lower 

 margin fringed with numerous long plumose setaa and some shorter smooth setae inserted 

 more deeply ; the smooth hind margin forms apically a small tooth which does not reach 

 beyond the lower margin. The first joint not reaching below the side-plate, a little 

 widened distally, with short setae on the front margin, long ones on the surface, long and 

 short on the hind margin ; the second joint short, with a group of apical spines behind ; 

 the third joint oblong, with the front apex pointed, the hinder rounded and fringed with 

 long spines ; the wrist longer and wider than the hand, widest after it becomes free from 

 the third joint, the front margin carrying six or seven groups of spines, almost all the 

 free hind margin crowded with slender pectinate spines of very various lengths, the apex 

 having some very .short by the side of some that are very long ; the hand a narrow oval, 



