1138 THE VOYAGE OF H.M.S. CHALLENGER. 



is very short, the second rather long, widening distally, with a very convex outer margin, 

 reaching a little beyond the outer plate, having seven spine-teeth set very closely round 

 the angled distal margin, and having seven slender spines arranged near the top of the 

 inner margin and under the distal margin. 



Second Maxillae. — The inner plate shorter and much narrower than the outer, the 

 row of plumose setae beginning above the midde of the inner margin, the row of spines 

 rather higher and continuing round the apex, but not descending the outer margin ; the 

 longer spines of the outer plate begin at the top of the inner margin, and pass round the 

 broad apex, five or six of them being on its outer slope. 



Maxillipeds. — The inner plates reaching beyond the first joint of the palp, having 

 several plumose setae on the inner margin, with a spine-tooth near and a denticle close 

 to the apex, and on the somewhat angled distal margin three strong spine-teeth and 

 several feathered spines ; the outer plates not reaching the end of the second joint of the 

 palp, their base very short, the serrate inner margin set with eight or nine spine-teeth, 

 closely followed by eight spines on the serrate distal margin, the first four elongate 

 spine-teeth, the last four tending to setiform ; the first joint of the palp very short, the 

 second two or three times as long, with setiform spines along the inner margin and 

 round the apical ; the third joint longer than the first, narrow, a little widened distally, 

 with spines on the upper part of the inner margin, round the apical, and across the 

 surface below the apical margin ; the finger is nearly as long as the third joint if the 

 ungual spine be included, this substitute for a nail being as long as the broad blunt- 

 ended basal part of the finger, which on the inner margin close to the root of the ungual 

 spine carries half a dozen other spines more slender, but some of them nearly as long. 



First Gnathopods. — Side-plates directed a little forward, of nearly even width 

 throughout, the lower and hinder margins convex, the front tending to concave. The 

 first joint reaching much beyond the side-plate, curving forwards, almost unarmed ; the 

 second joint short, with a group of several slender spines at the apex behind ; the third 

 joint with the convex front and hind margins on the inner surface converging to a 

 pointed apex, with numerous spines along the lower half of the hind margin, some 

 also on the front ; on the outer surface this joint is much narrower, its front margin 

 nearly straight ; the wrist triangular, distally cup-like, much shorter than the hand, with 

 a minute spine above the centre of the front margin and one or two slender spines at its 

 apex, the hind margin having a large group of spines on the rounded apex and the 

 adjacent distal margin, and a row of six or seven across the surface nearer the hind than 

 the front margin ; the hand is long and broad, with seven or eight groups of spines 

 adjacent to the long convex front margin, three or four on or close to the short serrate 

 hind margin, and four or five along the surface nearer the hind than the front margin ; 

 at the apex of the hind margin there is a stout palmar spine, and one above and one 

 below it ; the palm itself is oblique in a straight course, finely dentate or tuberculate, 



