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



remaining, the first longer than the first of the peduncle or the three following of the 

 fiao-ellum, rapidly tapering, fringed with a brush of long filaments ; the next joint short 

 and narrow, with a little apical spine and some marginal setules, the other joints longer, 

 not much thinner, similarly furnished. The secondary flagellum narrow, about as long as 

 the first joint of the primary, two-jointed, the terminal joint minute, missing in the 

 present specimen. 



Lower Antennse. — First joint little expanded, gland-cone very small, third joint 

 longer than broad, apically pointed, fourth joint considerably longer than fifth, broader 

 at the base than distally ; fifth joint longer than the third, narrowest at the base ; 

 flao-ellum with fourteen slender joints remaining, at the base abruptly narrower than the 

 peduncle. 



Upper Lip unsymmetrically bilobed, both lobes ciliated, the smaller also very finely 

 denticulate, and carrying some minute spine-teeth. 



Mandibles. — ^The cutting plate not very broad, with four or five teeth; the secondary 

 plate on the left mandible with four teeth, that on the right mandible more slender, with 

 two slender distal teeth and possibly some unobserved denticles ; the spine-row of six 

 curved denticulate spines ; the molar tubercle tolerably massive, with a strong tuft of cilia 

 at the front corner of its multidentate crown, and a small seta behind ; the palp shorter 

 than the body of the mandible, the first joint very small, the second abruptly broader, 

 nearly three times as long as broad, with two long plumose setae on the inner margin ; 

 the third joint minute, but tipped with two plumose setse, still longer than those on the 

 second joint. In the Plate the mandibles are figured from the outer side, so that the 

 right mandible is on the left, the left on the right, of the Plate. 



Lower Lip. — The principal lobes closely ciliated on the distal and inner margins ; the 

 mandibular processes short and narrow. 



First Maxillee. — The inner plate with five long plumose setae on the inner margin and 

 two short setae at the apex ; the outer plate appears to have eight small spines on the 

 truncate distal margin, of which the outermost is denticulate, three are distally furcate, 

 and the rest smooth; the second joint of the palp is strongly ciliated on the outer margin, 

 and has five spine-teeth on its distal border, the outermost being longer than the rest, 

 and pectinate. 



Second Maxillse. — The inner plate with a row along the inner margin of about eighteen 

 long setae slightly widened near the base ; the apical border of each plate furnished with 

 several plumose seta-like spines. 



Maxillipeds. — The inner plates short, not reaching the distal end of the first joint of 

 the palp, with about ten ciliated spines or setae on the sloping distal margin and upper 

 part of the inner edge, which below is strongly ciliated; the outer plate narrow, not quite 

 reaching the apex of the second joint of the palp, strongly ciliated on the outer margin, 

 which has at the top two long plumose setae ; there is also a long row of plumose setae 



