790 THE VOYAGE OF H.i\r.S. CHALLENGER. 



Loioer Lip. — The principal lobes distally rather narrow, little dehiscent, much 

 ciliated, on the inner margin each carrying two spines, which are short, not tapering, but 

 ending in a small double tip; the inner plates inflated; the mandibular processes divergent, 

 apically rounded and narrow. 



First Maxillse. — The inner plate fringed on the inner side with fifteen plumose setse, 

 the two at the apex being the shortest ; the outer plate having on the truncate distal 

 margin eleven strong spines in two rows of four and seven ; in the latter the two inner- 

 most are jJumose, the next three denticulate with from fourteen to eighteen denticles, the 

 other two with two or three denticles ; in the other row the outermost spine is broad, 

 simple, the other three are furcate, with the inner arm of the fork shorter than the outer, 

 these spines as well as some in the other row being finely plumose on the upper part of the 

 outer side ; the palp is long and slender, reaching much beyond the outer plate, its first 

 joint a good deal longer than broad, but not nearly half as long as the second, which 

 has on the apex four finely denticulate or serrate spines, followed by six more along 

 the inner margin. 



Second Maxillse. — The jslates difi"ering but little from one another in length and 

 breadth, the inner plate having a series of about eighteen long plumose setae, beginning 

 near the base of the inner margin and passing nearly to the distal outer corner ; further 

 from the base begins a series of shorter plumose setae, which keep to the margin till they 

 approach the apex and become submarginal, the apex itself being fringed Avith plumose 

 spines not passing down the outer margin ; the apex of the outer plate is fringed with 

 long curved spines, showing some plumosity below and pectination above ; shorter spines 

 pass a little way down the outer margin. 



Maxillipeds. — Inner plates broad, reaching beyond the distal end of the first joint of 

 the palp ; nine strong plumose spines pass along the upper part of the inner margin round 

 to the outer corner, the three along the distal margin being mixch shorter than the others; 

 near to these are two curved more slender spines on the distal margin, which is broad, 

 irregularly sculptured, sloping a little inwards, and armed with two strong tapering spine- 

 teeth ; on the outer surface at a little distance from the inner margin there is a row of 

 three spines, as shown in the more highly magnified portion of the figure mxp, the 

 uppermost of these spines being broad and curved, the next longer and thinner, and the 

 lowest still longer ; the outer plates not reaching the distal end of the second joint of 

 the palp, fringed with a row of some sixteen teeth or spines, eight or nine being regular 

 spine-teeth on the inner margin, the remainder with increased length passing gradually 

 into plumose setae round the distal margin ; there are also several groups of slender 

 spines on the surface within the inner margin ; the first joint of the palp short, the second 

 long, fringed with long spines or sette on the inner margin, the third joint longer than 

 the first, fringed with spines on both margins and round the apex ; the finger long 

 and tapering, the dorsal cUium set near the base of the nail, which is as long as or longer 



