1180 THE VOYAGE OF H.M.S. CHALLENGER. 



long and most of them a little curved, form in the aggregate a thick bush reaching; 

 beyond the apex. 



Lower Lip. — The distal margins of the principal lobes broadly rounded, the inner 

 margins dehiscent, retreating from one another before they re-advance to meet near the 

 base ; the inner lobes oval, with their distal and inner margins, like those of the principal 

 lobes, strongly ciliated ; the mandibular processes narrow, divergent. 



First Maxillse. — The inner plate with straight inner margin partly strongly ciliated, 

 and at the narrow apex carrying a seta attended by two or three very small setules ; the 

 outer margin convex ; the outer plate with a bush of cilia near the base, the apical border 

 carrying eleven strong spines, with strong but not numerous latei'al denticles, five of the 

 spines a good deal longer than the rest, one long one and one short one furcate, and one 

 or two more of the short ones with a single denticle, one of them certainly with two 

 denticles ; the first joint of the palp is little longer than broad, and has two setules on 

 the outer margin ; the second is curved, reaches beyond the outer plate, widens a little 

 distally, has a setule on the outer margin not far from the base, and eight strong spine- 

 teeth on the apical border, the outermost the longest : below these on the surface and 

 approaching the inner margin are four slender spines. 



Second Maxillse. — The inner plate not quite so long as the outer, as broad or distally 

 a little broader ; a series of about thirty-five plumose setse beginning near the base passes 

 in a gentle curve along the surface towards, but not to, the outer apex, a long series of 

 spines passes along the inner margin and becomes crowded at the inner apex, but there 

 stops, leaving the remainder of the distal margin unoccupied ; of the outer plate the 

 whole apical margin is crowded with long spines. 



Maxillipeds. — The inner plates are broad, reaching about as far as the distal end of 

 the palp's first joint, with plumose setae on the inner margin, and three spine-teeth and 

 feathered spines on the distal margin ; the outer plates reach beyond the middle of the 

 second joint of the palp, with nine spine-teeth on the inner margin, and six longer spines 

 on the apical ; the slender spines within the inner margin are long ; the first joint of the 

 palp has two spines on its inner margin, and is less than half the length of the long second 

 joint, which is slender, and has numerous long spines on and near the inner margin ; 

 the third joint is not longer than the first, the distal half carrying many spines; the finger 

 is narrow and little curved, with a short spine-like movable nail (or ungual spine), the 

 two together longer than the third joint ; on the inner margin of the finger, near the base 

 of the nail, three or four setae or setules are inserted. 



First Gnathopods. — The side-plates very small. The first joint scarcely at all covered 

 by the side-plate, of very even breadth throughout, carrying some marginal setules ; the 

 second joint short, the distal half of the convex hind margin fringed with slender spines, 

 those near the apex being very long and numerous ; the third joint with convex margins 

 converging to an acute apex which rests upon the wrist, the hind margin fringed with 



