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



front, and a small denticle (on one maxilla two unequal denticles) behind it, the three 

 following pairs consisting of a long slender slightly denticulate spine, and a shorter with 

 from five to six radiated denticles near the apex, the longest lowest ; the second joint of 

 the palp reaching beyond the outer plate, its outer margin convex, the broadest part of 

 the joint near the centre ; the distal margin strongly toothed, with six or seven (longer 

 or shorter) spine-teeth in the interstices, the outermost the longest ; three slender sub- 

 marginal spines attend the spine-teeth, and three are placed, not in line, on the surface 

 near the middle of the outer margin. 



Second Maxillse. — Inner plate equal in breadth and almost in length to the outer, 

 with a row of four plumose setae beginning about the middle of the inner margin, and 

 advancing but little on to the surface ; the upper part of the inner margin and the apex 

 fringed with short spines ; the outer plate has long spines, plumose below and pectinate 

 above, round the upper part of the inner margin and the apex, with some small spines 

 on the upper part of the outer margin. 



Maxillipeds. — Inner plates reaching a little beyond the first joint of the palp, with 

 three spine-teeth on the truncate distal margin, several short curved spines, and a slender 

 submarginal spine-tooth close to the apex of the inner margin ; the outer jdates not 

 reaching the distal end of the second joint of the palp, strongly ciliated on the outer 

 surface near the outer margin, the inner margin serrate, devoid of teeth, with a row of 

 slender spines on the outer surface, not far from the inner margin ; round the distal 

 margin and descending the outer are ten or more long curved spines and setae, forming 

 the usual gradation from one into the other ; first joint of the palp short ; second nearly 

 twice as long, distally a little expanded, with several long spines on the straight 

 inner margin ; the third joint slender, equal in length to the first, produced in a small 

 cap over the base of the finger, the edge of the cap appearing pectinate by the projection 

 of adpressed cilia ; the finger slender, with a sharp spine-like nail accompanied by a 

 cilium at its base ; dorsal cilium of the finger small, near the base. 



Of the triturating organ of the stomach, all the spines appeared to be long and 

 slender. 



First Gnathopods. — Side-plates short and squared, slightly outdrawn at the lower 

 front angle. First joint reaching much beyond the side-plate, longer than the next three 

 joints put together, but shorter than the hand ; second joint short ; third a little longer, 

 rhomboidal, with several spines about the distal margin ; wrist triangular, distally wide, 

 somewhat cup-like, with many j)ectinate spines on the hind margin ; the hand broader than 

 the wrist, more than twice as long as its own breadth, the long front margin convex, 

 smooth, except at the apex, the shorter hind margin with four groups of pectinate or plumose 

 spines ; the palm oblique, sinuous, with a tooth process followed by a small crenate 

 emargination near the hinge of the finger ; the sinuous portion is cut into very numerous 

 spinule-like close -set teeth ; the strong curved finger has a small dorsal cilium near the 



