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



figure 'HI, so that the secondary plate, spine-row, and molar tubercle are not in view 



except so far as their position may be gathered through the partial transparency of the 



mandible. 



Lower Lip. — The forward lobes strongly ciliated on the apical and inner margins, 



scarcely dehiscent ; the mandibular processes long, narrow, curving outwards. 



First Maxilla). — Inner plate small, with two unequal plumose setae on the apex ; the 



outer plate also closely resembling that in Amaryllis hathycephalus, with eleven strong, 



variously dentate spines at the distal end, and a small fold of the outer margin near the base. 

 Second Maxilla) scarcely diifering from those of Amaryllis hathycephalus, the outer 



plate less narrowed apically than the inner. 



Maxillipeds. — Similar to those of the species just mentioned, but differing in having 



the inner plates rather shorter and broader, with the apical margin less oblique, and in 

 having the apical margin of the outer plates less evenly rounded. The fourth joint of 

 the palp is narrow, its obtuse apex carrying two setse ; it it not quite so small as in the 

 two comjianion species. 



First (rTiai/io^oc/.s-.— Side-plates small, more than half concealed by those of the next 

 segment, the length and breadth equal, the front and lower margins rounded, the 

 hinder straight, the first joint attached at the lower hinder extremity, greater in breadth 

 throughout than any other joint, and nearly or quite equalling the united length of the 

 four following ; numerous setge on the sinuous front margin, a few on the straight hind 

 margin, which has a long tuft at the end ; the second joint widened below, as long as 

 the third; the third pointed below; the wrist longer than the long tapering hand, carrying 

 on its hinder margin several groups of spiniform setse such as occur in smaller numbers 

 on the two previous joints ; the hand is strongly pectinate along the hind border, 

 ■where it also has spines and setae ; there are also groups of sette along the surface, 

 besides some small ones on the front border ; there is no palm ; the small curved finger 

 has a tooth lying along the inner edge near the nail ; it has also a dorsal cilium near the 

 hinge, and one or two cilia on the inner margin. 



Second Gnathopods. — Side-plates more than twice as long as those of the preceding 

 segment, the back border angled below the centre, the lower border a little serrate and 

 crenulate, not ragged as in the figure gn. 2. The branchial vesicles from a narrow neck 

 expanding at once to the greatest breadth, thence narrow gently downwards, and are 

 as long as the first joint of the limb. The marsupial plates narrow, with small cilia 

 on the front margin ; on the hind margin and apex no setae were present in our specimen, 

 but the points of attachment indicated that they either had been or were to be. The first 

 joint of the limb not so long as wrist and hand united, attached just above the angle of 

 the hind margin of the side-plate, below bending a little backwards ; the second joint 

 longer than the third ; the thii'd ending in a long triangle with three or four cilia-like 

 set^ on the hind margin; the wrist very long and narrow, nearly twice as long as the 



