1104 THE VOYAGE OF H.M.S. CHALLENGER. 



Upper Lip. — The distal margin broad, furred, rather unsymmetrically insinuate. 



Mandibles. — The cutting-edge divided into six or seven unequal teeth ; the 

 secondary plate on the left mandible divided into four or five teeth like those on the 

 principal plate ; on the right mandible the secondary plate is more ribbon-like, obliquely 

 cut into four sharp teeth facing the principal plate, the lowest of the four much the 

 longest ; the spine-row is long, containing eleven or twelve long denticulate spines ; the 

 molar tubercle is very prominent, with finely dentate somewhat rounded crown ; the palp is 

 large, the first joint short, widest distally ; the second joint of moderate length, carrying 

 in front two rows of spines, many of which are very long ; near the middle of the hind 

 margin is a group of three, and a smaller group above, and another below, the middle ; 

 the third joint is as long as the second and distally wider; on the outer surface near 

 the base are seven or eight long spines, and two others above them on the inner surface 

 close to the outer margin ; this margin is convex, interrupted a little before reaching the 

 apex, and at that point shows a transverse group of several long, curved, slightly 

 feathered spines ; the apex itself is broad, fringed with similar spines, and there are 

 many spines down much of the convex inner margin, but these spines are smaller than 

 those at the apex. 



Lower Lip. — The principal lobes distally broad, strongly ciliated along the inner 

 margin, at the distal part of which there are two little spines ; the oval inner plates are 

 broad distally and strongly ciliated ; the mandibular processes are very narrow and 

 divergent. 



First Maxillge. — The inner plate with a sinuous inner margin, fringed with nine 

 spaced setse ; the apex acute, tipped with a setule ; the inner plate having ten spines on 

 the distal margin ; the innermost has a single lateral denticle low down ; this is followed 

 by three which have two lateral denticles on the outer side, the lower of the two 

 exceedingly small, one spine is apically furcate ; the remainder appear to have few 

 denticles on the inner margin ; the first joint of the palp is short, the second long, curved, 

 widening a little from the base, having seven serrate spine-teeth on the distal margin, 

 and about ten slender spines on the distal part of the inner margin and submarginal to 

 the apex. 



Second Maxillae. — The inner plate shorter than the outer and a little less broad, 

 with a row of twenty-six long plumose setse passing from the base of the inner margin 

 across the surface towards the outer apex ; much of the inner margin fringed with spaced 

 spines, and the front part of the rounded apex with close-set spines ; the outer plate 

 with many spines round the apex. 



Maxillipeds. — The inner plates oblong, reaching beyond the first joint of the palp, 

 with numerous plumose setse on the inner margin, three spine-teeth and several feathered 

 setse or spines along the broad distal margins, which slope a little inwards near the inner 

 angle ; the outer plates not nearly reaching the end of the palp's second joint, the inner 



