1210 THE VOYAGE OF H.M.S. CHALLENGER. 



groups, most or all being feathered ; the third joint is longer but narrower than the 

 second, much curved, nearly the whole extent of the concave front margin being closely- 

 fringed with long and short feathered or pectinate spines, the longer ones being sub- 

 marginal in origin ; there is a dense group of not very long spines on and below the 

 narrow truncate apex, and close to the base of the outer margin there are two on the 

 outer surface. 



Lower Lip. — The principal lobes broad, distally rounded ; the inner lobes appearing 

 to be scarcely separated from the principal ; the mandibular processes small. 



First Maxillm. — The inner plate with two strong plumose setae on the narrow 

 oblique apical margin just below the pointed apex, on which, in the small specimen, 

 one maxilla has a third seta ; the inner margin much ciliated ; the outer plate having 

 eleven strongly denticulate spines on the apical margin, one row of five with numerous 

 small denticles, from four to seven in number, the other row of six rather stouter with 

 stronger denticles, two or three in number ; the first joint of the palp a little longer 

 than broad, the outer margin longer than the inner, the second joint reaching consider- 

 ably beyond the outer plate, with very convex outer margin, the distal margin carrying- 

 seven serrate spine-teeth, the outermost the longest, and one submarginal setiform spine ; 

 in the small specimen there are only four spine-teeth. 



Second Maxillte. — The outer plate shorter than the inner, each with numerous 

 strongly feathered spines round the apical margin ; a few shorter spines are on the outer 

 margin of the outer plate below the apex, aud some larger plumose seta? longer than the 

 spines on the inner margin of the inner plate. 



Maxillipeds. — The inner plates not nearly reaching the distal end of the palp's first 

 joint, with plumose setae on the inner margin, three spine-teeth and some feathered 

 spines on the distal margin ; the outer plates scarcely reaching the middle of the second 

 joint of the palp, the inner margin without spine-teeth, but fringed with some eighteen 

 pairs of slender submarginal sjnnes; without break in the series of spines, beyond the 

 apex of the inner margin, the distal margin has its curve set with eight strong feathered 

 spines ; the first joint of the palp is not especially short, and has several groups of spines 

 on the inner margin, and a group at the apex of the outer ; the second joint is not twice 

 as long as the first, densely fringed with spines on the inner margin, having also two 

 groups on the inner surface, and three on the outer margin ; the third joint is narrower 

 but nearly as long as the second, the distal half buried in successive rows of spines ; 

 amidst those round the apex a short finger with a short sharp nail dimly appears with 

 several spinules along its inner margin near the nail. In the fig. mxp., on PI. CXXXIV., 

 the palps appear to have five joints, but the line which divides the outer plate from its 

 base, though it represents an actual thickening of the joint along the line of the 

 muscles, should have been omitted, as it is misleading. 



The triturating organs of the stomach show an outer row of short, strong, acute, 



