1084 THE VOYAGE OF H.M.S. CHALLENGER. 



tips. The inner lobes are strongly ciliated ; the mandibular processes are very long, thin, 

 and divergent, but with a slight inward curve. 



First Maxillse. — The inner plate small, with a long plumose seta on the apex ; the 

 outer plate broad, having on the truncate distal margin ten denticulate spines, of which 

 one is simply furcate, two have one denticle apiece on the outer margin, the rest have 

 from two to six denticles on the inner margin not very near to the apex ; the first joint 

 of the palp very short, the second long, not distally widened, curving over the outer 

 plates, the distal margin carrying on one maxilla seven, on the other eight, spine-teeth, 

 the outermost the longest ; a series of seven slender spines begins on the outer surface a 

 little way down the inner margin, and passes across towards the outer apex. 



Secorid Maxillse. — The inner plate rather shorter than the outer, with a series of 

 plumose setse beginning near the base of the inner margin and passing across the surface 

 towards the outer apex ; a series of spines begins below the middle of the inner margin 

 and passes round the margin nearly to the outer distal corner ; the outer plate has the 

 distal margin fringed with long spines, and some shorter ones descend the outer margin 

 for a short space. 



Maxillipeds. — The inner plates broad, reaching nearly as far as the apex of the first 

 joint of the palp, the distal margin broad, sloping away a little at the outer corners, 

 carrying three spine-teeth and several slender feathered spines, the inner margins having 

 plumose setge and a spine-tooth close to the apex ; the outer plates very broad, not reaching 

 the end of the second joint of the palp, fringed on the serrate inner margin with about a 

 dozen spine-teeth, the series being continued by five spines on the distal margin, below 

 which on the very convex outer margin are three more, spaced, the lowest shorter than 

 the preceding ; the first joint of the palp short, the second long and rather broad, carrying 

 spines at the outer apex and along the inner margin ; the third joint longer than the first, 

 expanding distally, and produced in a small pointed cap over the base of the finger, armed 

 with feathered or pectinate spines before and behind, on the surface and at the apex ; the 

 finger is slender, slightly curved, tapering, tipped with a small very sharp nail, near the 

 base of which the inner margin carries two or three setules. 



First Gnathopods larger than the second. The side-plates small. The first joint 

 reaching much beyond the side-plate, with small groups of spines at points of the hind 

 margin and spinules in front ; the short second joint with an apical group of several small 

 slender pectinate spines ; the third joint small, with many spines on the hind margin 

 and its rounded apex, and on the surface near the front, the apex in front acute ; the wrist 

 massive, not quite so broad as long, nor so long as the hand, with five groups of spines on 

 the convex front margin, the serrate hind margin thickly fringed with serrate spines, of 

 which there are also groups on the surface and broad lower margin ; the hand massive, 

 with some seven rows of long spines at or near the convex front margin ; the serrate hind 

 margin is fringed with several groups of spines, and apically forms a triangular tooth the 



