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



joint of the palp overtops the outer plate, and has a small spine-tooth below the apex, 

 and a row of six on the apex, the outermost being longer and more slender than the 

 rest ; a row of small setae runs below the apical margin. 



Second Maxillse. — The plates moderately broad, with rounded apices ; the inner 

 plate a little shorter and narrower than the outer, with ten or a dozen plumose setae, 

 beo-innino- on the inner margin near the base and passing round towards the outer 

 apex ; the apical margin friuged with rows of curved spines ; the apical margin of the 

 outer plate fringed in like manner, the largest spines outermost, followed by a few 

 smaller ones down the outer margin. 



Maxillipeds. — Inner plates reaching about as far as the apex of the first joint of the 

 palp, apical margin straight, with three spine-teeth and a row of plumose setae beginning 

 below the apex on the inner side, passing along it and ending just below it on the outer 

 side, some long plumose setae on the inner margin ; outer plates small, not nearly reaching 

 the end of the second joint of the palp, with eight long spine-teeth on the inner margin, 

 followed by a longer spine-tooth and five plumose setae round the apical, and a little 

 descending the hinder, margin ; there are also numerous groups of setae on the outer 

 surface, within the inner margin of the plates ; the second joint of the palp longer than 

 the first ; the third as long as the first, with setae on surface and apex, some of the latter 

 strongly pectinate ; finger slender, with a sharp nail. 



First Gnathopods. — Side-plates oblong, rounded lower margin fringed with setae, two 

 or three of which also occur on the hind margin. The first joint reaching a little 

 below the side-plate, with some setae along the hinder, and two or three near the base on 

 the front, margin, some pectinate spines at the apex behind ; the third joint short, with 

 pointed apex, just above which is a row of setae and a pectinate spine ; the wrist in the 

 male a little shorter, in the female a little longer, and distally a little broader, than the 

 hand, with rows of pectinate spines on the hinder margin and the surfaces near it, a group 

 of setae at the front apex ; the hand between oval and oblong, with groups of seta-like 

 pectinate spines on both surfaces and near both margins ; the palm oblique, a little 

 sinuous, minutely crenate, bordered with cilia, defined by a group of stout but slenderly 

 pointed spines of various sizes, the smallest outermost ; the finger reaching just to the 

 extremity of the palm, with a little constriction of the outer margifi at the base of the 

 nail ; the dorsal cilium short. 



Second Gnathopods. — Side-plates a little longer and broader than those of the 

 preceding segment, otherwise similar. The branchial vesicles a long oval, longer than 

 the first joint of the limb ; the marsupial plates in the female specimen figured were 

 short, oval, smooth-rimmed. The joints of the limb scarcely difi"er from those of the first 

 pair, the first joint longer, and descending further below the side-plate, the hand 

 considerably longer in the male, and a little longer in the female, than the wrist ; arma- 

 ture practically identical. 



