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



articulated first joint, and very many long slightly feathered spines on the serrate 

 margins of the triangular apex of the second joint, which scarcely reaches the bases of 

 the spines of the outer plate. 



Second Maxillw. — The inner plate rather longer than the outer and immensely 

 broader, especially at the base, from which it narrows gradually to the apex ; the inner 

 margin armed with about thirty-six long, spine-like, plumose setse, the tips unfeathered, 

 and a parallel row of some twenty shorter spines, with the distal portion denticulate ; 

 these spines increase in length as they approach the apex, where there are some long 

 spines, plumose below, denticulate above ; the outer plate, of tolerably even width 

 throughout, has many large spines on the apex, slightly denticulate, and a few slender 

 and setiform at the tip of the inner margin. 



Maxillipeds. — The inner plates greatly inflated, not reaching so far as the distal end 

 of the first joint of the palp ; the inner margins convex, distally dehiscent, fringed with 

 long minutely feathered spines rather than set?e, the series passing round to the outer 

 distal angle, where the flattened distal margin carries a thin spine bending over two 

 little straight spinules ; some way down the outer margin there are two strong spines ; 

 the outer plates narrow, not reaching the distal end of the second joint of the palp, armed 

 along the serrate inner and distal margins with long slender spines, of which there are 

 groups also on the outer surface near the inner margin ; first joint of the palp subequal 

 in length to the second ; both armed on the inner margin, the second also on the outer 

 apex, with long slender spines ; the third joint much shorter than the second, very slender, 

 with slender spines along the inner margin and about the apex, one or two of the latter 

 longer than the finger ; the finger thin and nail-like, with a very small dorsal cUium 

 at a fourth of the finger's length from the base. 



First Gnatliopods. — The side-plates small, almost triangular, with the free margin a 

 little curved. The first joint about as long as the next four joints united, the front 

 margin straight, fringed with setae, the hinder a little sinuous, with many very long 

 slightly plumose setse on or near it ; the second joint short, with plumose setee at the 

 hinder apex ; the third joint with plumose setae at two points of the hind margin, and 

 along the distal border, which forms a pointed apex in front ; the wrist is longer than 

 the hand and distally broader, with several strong spines on the hinder margin, as well 

 as groups of setse here and on both surfaces, and at the apex of the front margin ; the 

 hand tapers much towards the distal end ; the serrate hind margin is nearly straight, 

 carrying ten or eleven groups of long spines and setae, and several groups of long setse 

 also on the surface and on the front margin, the distal part of which is serrate ; the 

 finger is small and slender, about half the length of the hand, at the apex of which it is 

 fixed, having no palm to close against, the long spines and stiff" setae of the hind margin 

 perhaps for some purposes serving instead of a palm. 



Second Gnathojyods. — Side-plates parallel-sided, the lower margin continuing the 



