1074 THE VOYAGE OF H.M.S. CHALLENGER. 



surface covered with small denticles ; it has a plumose seta at one corner ; the first 

 joint of the palp is twice as long as broad ; the second about twice as long as 

 the first, with three spines on and two near the front margin ; the third joint 

 shorter than the second, with more than half of each margin clear of spines, of which 

 there are two planted close to the convex hind margin a little above the centre, while on 

 the straight front margin there is a row of half a dozen long and strongly pectinate 

 spines passing up to the narrow apex, and parallel with these are two rows of short 

 pectinate spines. 



Lower Lip. — Both the principal lobes were widely dehiscent, causing the mandibular 

 processes to appear nearly parallel ; it is however obvious that if the lobes came nearer 

 together, the mandibular processes would become proportionately divergent ; the principal 

 lobes have their distal margins fringed with sj>ines, set close together and very numerous, 

 as many as thirty, the inner margins are as usual ciliated, as are those of the inner lobes, 

 which apically are narrow ; the mandibular processes are long and acute, the outer 

 margins convex, the inner tending to concave. 



First Maxillw. — The inner plate very small, closely pressed against the outer plate, 

 carrying a single very long thin plumose seta on the apex ; the ten spines on the apical 

 margin of the outer plate seem in no case to have more than three lateral denticles ; 

 of the three outermost one showed no denticle, of the next pair one was apically 

 furcate, of the remainder two had a single denticle apiece on the outer side ; the first 

 joint of the palp is rather longer than broad, the second, expanding from the base, curves 

 beyond the outer plate, with a spine below the middle of the very convex outer margin, 

 seven or eight serrate spine-teeth on the apical border, and several slender spines, perhaps 

 a dozen, beginning near the middle of the concave inner margin, and passing across to 

 the outer apex. 



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

 a series of about twenty-four plumose seta3, beginning low down on the inner margin, 

 and passing in a curve on the surface across towards the outer apex ; there are spines at 

 intervals round much of the inner margin, and densely set on the rounded, rather narrow, 

 apical margin ; the outer plate, of almost uniform breadth, has the outer margin convex, 

 the inner tending to concave, the distal almost truncate, with an outward slope ; on the 

 inner corner are many spines, and some long ones in a series, commencing on the inner 

 margin and passing across the inner apex ; the rest of the distal margin is occupied by 

 six or seven smaller spines not closely set. 



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

 palp, having many plumose setse on the inner margin, and a spine-tooth near its apex ; 

 the irregular apical margin, which slopes abruptly at the outer corners, carries four spine- 

 teeth and many slender plumose spines ; the outer plates reaching the apex of the second 

 joint of the palp, with eleven spine-teeth on the serrate inner margin, and eight spines 



