1088 THE VOYAGE OF H.M.S. CHALLENGER. 



slender spines, some of them long ; the flagellum of seven joints, together not equal to 

 the fifth joint of the peduncle, several of them tipped with curved spines, which on the 

 last joint are short. 



Upper Lip as in Autonoe philacantha. 



Mandibles. — The cutting edges do not appear to have more than five teeth, the 

 secondary plates four, or on the right mandible, perhaps only three ; the spines of the 

 spine-row five on the left, six on the right, mandible, slender, not very conspicuously 

 denticulate, curved, and directed backwards ; the molar tubercle prominent, with 

 strongly denticulate crown and a plumose seta ; the first joint of the palp a little dilated 

 distally, the second joint with a few long and short spines along the front ; the third 

 joint as long as or longer than the second, and nearly as broad for much of its length ; 

 the front margin carrying four and the apex two long pectinate spines, the distal half 

 of the inner margin being fringed with some fifteen short pectinate spines, the length 

 slightly increasing as they approach the apex ; besides these there is below the centre a 

 transverse row of four unequal but very long curved pectinate spines near the outer 

 margin, and above the centre a spine on the surface near the inner margin. 



Lower Lip. — The principal lobes rather broad distally, the inner part of the distal 

 margin and the inner margin ciliated, without spines ; the inner lobes ciliated ; the 

 mandibular processes long, pointed, divergent. 



First Maxillae. — The inner plate small, with a long, not strongly plumose, seta on 

 the apex ; the outer plate with ten spines on the distal margin, constructed on the same 

 general plan as those in Autonoe philacantha, but seemingly with only two or three 

 lateral denticles where in the other species there were three or four ; the first joint of 

 the palp short, with a small spine on the outer apex, the second joint curving over but 

 not much beyond the outer plate, a good deal broader distally than at the base, the 

 indentured distal margin in one maxilla having six, in the other five, spine-teeth, the 

 outermost the longest ; there are five slender spines on the surface nearer to the inner 

 than to the outer apex. 



Second Maxillae. — The inner plate shorter but slightly broader than the outer ; a 

 row of twenty-one setae passes almost from the base of the inner margin across in a curve 

 towards the outer apex ; there are also some slender spines on the inner margin and 

 round part of the apical margin ; the outer plate has a straight inner margin, near the 

 apex of which begins a series of half-a-dozen subapical spines, the apical margin itself, 

 which is rounded with an outward slope, carrying several more. 



Maxillipeds. — The inner plates broad, reaching as nearly as possible the distal end of 

 the first joint of the palp, with several long setae along the inner margin, and a bent 

 spine-tooth just below the apex ; the distal margin broad, occupied by three strong 

 spine-teeth and a few slender setiform spines ; the outer plates very broad, not reaching 

 the end of the palp's second joint, with seven spiDe-teeth on the inner margin, and 



