96G THE VOYAGE OF H.M.S. CHALLENGER. 



serrate edges, and having some smaller denticles on the sides ; the spine-row consists of 

 four elongate denticulate spines ; the molar tubercle prominent, without being very large, 

 its transversely elliptical crown set with many denticles ; the palp set just over the molar 

 tubercle, its first joint short, the second decidedly shorter than the third, with some seven 

 long setae along the outer surface, and some short ones on or near its convex inner margin ; 

 the long slender third joint with a group of four setae on the outer surface near the base, 

 and not far from the convex outer margin ; the inner margin not convex, fringed for most of 

 its length with pectinate spines, of which the narrow apex has five, two long and three short. 



Lower Lip. — The principal lobes distally rounded, dehiscent, much ciliated ; the inner 

 lobes distally broad in proportion to their depth ; the mandibular processes short, apically 

 rounded. 



First MaxillsB. — The inner plate almost oblong, with one plumose seta on the distal 

 margin ; the outer plate with eleven elongate spines, the innermost taking its rise lower 

 on the plate than the rest, long, very thin, with seven small lateral teeth, the next four 

 with four or five long lateral teeth, the next which is stouter and more curved with only 

 one or two lateral teeth, the outermost with three, the remaining four in the parallel row 

 are long and slender, with from four to six small denticles apiece ; the first joint of the 

 palp fully half the length of the second ; the second reaching beyond the outer plate, its 

 inwardly sloping apical border fringed with eleven slender spines or setae. 



Second Maxillae. — The inner plate broader and shorter than the outer, the fringing 

 setae neither numerous nor long, reaching about halfway down the inner margin, 

 and halfway aci'oss the broad distal margin ; some being submarginal in origin ; the 

 outer plate has the apex somewhat narrowed, with spines of some length, the series passing 

 a little way down the inner and outer margins, the three spines on the outer margin being, 

 however, short and seta-like. 



Maxillipeds. — The " prismatic " inner plates are short, scarcely reaching the centre of 

 the first joint of the palp, with two short spines close together near the inner apex, the 

 distal border truncate, carrying at the inner corner a setiform spine, three strong spine- 

 teeth close together on the margin, followed on the outer slope by three slender curved 

 spines ; the outer plates reach the middle of the second joint of the palp, the inner margin 

 bordered with twenty spines, the pectinate distal half of which is abruptly narrower than 

 the proximal ; two more, rather longer than the rest, occupy the apex, beyond which on 

 the curve of the outer margin are four long slightly feathered spines or setae, much more 

 widely apart than the spines of the inner margin and apex ; there is also on the outer 

 surface near the inner edge a submarginal row of slender spines ; the first joint of the 

 palp has the outer apex acute ; the second joint much longer, widening distally, with 

 a few setae and setules on the upper half of the outer margin, many setae or spines along 

 the inner margin, and some on the surface, especially near the apex ; the third joint rather 

 longer than the first, with spines on the distal part of the inner edge, and on the surfaces 





