1110 THE VOYAGE OF H.M.S. CHALLENGER. 



sharp ; there is a plumose seta on the side ; in the right mandible the crown of the 

 tubercle has two or three acute points independent of denticles ; the first joint of the 

 palp little longer than broad ; the second long, bent forward at a little distance from 

 the base, then straight, haviug three small spines standing out straight on the lower 

 part of the front margin, and higher up several long pectinate spines on or near both 

 margins ; the third joint narrower and shorter, straight, with the hind mai'gin slightly 

 convex, the front margin and narrow apex carrying about twenty spines, most of them 

 long, curved, and pectinate ; the hind margin having quite near the base a very long and 

 a shorter curved spine. 



Lower Lip. — The rounded distal margins of the principal lobes not strongly ciliated, 

 the inner lobes distally a little narrowed ; the mandibular processes divergent. 



First Maxillse. — Inner plate small, oval, with three plumose setae at intervals on 

 the distal part of the inner margin, followed by two setules on the apex; the outer 

 plate with probably ten slender spines on the rather broad truncate distal margin, 

 several of which have five little lateral teeth, while three are distally furcate, in two 

 the hinder branch the shorter ; the first joint of the palp a little longer than broad ; 

 the second joint reaching much beyond the outer plates, undilated, the apical border 

 armed with five spine-teeth, none of them broad, the outermost the longest ; there are 

 also some slender spines below the apical border and along the upper part of the inner 

 margin. 



Second Maxillse. — The plates about equally broad, the inner the shorter, with many 

 slender spines round the distal margin, and some setae descending the inner margin for a 

 little distance ; the spines on the distal border of the outer plate longer, as usual, than 

 those on the inner, with a few feathered spines on each side below the distal margin. 



Maxillipeds. — The inner plates not quite reaching so far as the distal end of the 

 palp's first joint, fringed with long plumose setae on the upper part of the inner margin, 

 which has a very small spine-tooth near the apex ; the distal margin sloping slightly 

 outwards, carrying two small spine-teeth and several slender spines; the outer plates 

 not nearly reaching the end of the palp's second joint, the inner margin faintly serrate, 

 unarmed (unless by spines on the adjacent surface) until near the apex when the 

 margin is serrate for the insertion of three slender spine-teeth ; on the distal margin 

 there are three long curved setiform spines ; the first joint of the palp is very short, 

 the second long and narrow, with many spines along the inner and some along 

 the outer margin ; the third joint is longer than the first, expanded distally over the 

 base of the finger, with many long spines about the apical part ; the finger is short and 

 broad and blunt, tipped with long spines instead of a nail, and having along the distal 

 half of the inner margin six or seven spines of great length. 



First Gnathopods. — The side-plates small and rhomboidal, the lower corner directed 

 forwards but not reaching the base of the lower antennas ; it carries a single setule or 



