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



second joint of the maxillipeds, carrying two spines on a fold of the inner surface, one on 

 the middle of the fold's distal margin, the other below its inner apex ; the distal margin 

 of the plate broad, a little sculptured for three spine-teeth, of which two are near the 

 inner and one near the outer apex; the second joint dilated on the distal part of the 

 outer side, where it carries many spines on the apical border, and one or two on the outer 

 border below the apex ; on the inside the joint is produced into a quite rudimentary plate, 

 almost conical, with two spine-teeth on the inner margin, one at, the other just below, the 

 apex ; the first joint of the palp longer than the second, with many spines along both 

 maroins and on the outer apex ; the second joint with spines along the inner margin and 

 the inner surface near this margin, and with one spine on the outer apex ; the third joint 

 as long as the second, the outer apex forming a ciliated cap over the hinge of the finger ; 

 there are spines about the apex both at front and back ; the finger is nearly as long as the 

 third joint, with a small dorsal cilium not far from the base, a short curved nail, and the 

 inner margin closely furred with cilia. 



First Gnathopods. — Side-plates wider below than above, the lower corner in front 

 produced over the base of the upper antennse. The first joint long, reaching far below 

 the side-plates, distally narrowing a little, the margins more or less fringed with setules ; 

 the second joint longer than broad, with setules on or near the hind margin ; the thii'd 

 joint very inconspicuous, much smaller than the second, the apex pointed, lying on the 

 wrist ; the wrist much longer than the hand, longer than the first joint, the basal part 

 forming a great bulb, from which the long narrow heel is produced behind, apically curving 

 over the outer margin of the finger (when closed) almost to its base ; the inner edge set 

 with small hairs at intervals, rounded and lined with innumerable scale-like minute tubercles 

 recalling to mind the palate of a dog-fish ; the hand is narrowly oblong, about as long as 

 the calx or produced portion of the wrist, the hind margin very finely serrate with a 

 beaded appearance, set wdth small hairs, and the distal half having eight small spines, to 

 the seventh of which the tip of the slender curved finger reaches, the hand margin being 

 at this part gently curved for what may be considered as the palm, though it is continuous 

 with the straight portion of the hind margin ; the finger half the length of the hand. 



Second Gnatliopods. — Side-plates squared, but with the corners rounded, the breadth 

 rather greater than the depth. The branchial vesicles rather longer than the first joint 

 and of about the same breadth. The marsupial plates as long as the first joint, much 

 narrower, fringed with long setse. The first joint broad, reaching much below the side- 

 plates, much shorter and narrower than the hand, with some spinules on the margins, and 

 setse on the inner side of the apex; the second, third and fourth joints are all channelled 

 in front, and combine to form a sort of irregular cup for the hand ; the second joint has 

 the hind margin smooth, and a pointed apex in front on the outer side ; the third, which 

 is not longer than the second, has a pointed apex in front on the inner side ; the wrist is 

 produced along the hind margin of the hand as far as the palm, this long heel or process 



