1266 THE VOYAGE OF H.M.S. CHALLENGER. 



On points not mentioned by the preceding authors quoted the following details may- 

 be added : — 



The animal is in many parts covered with a very short fine down. 



Eyes round, small, but with numerous ocelli. 



Lower Antennse having the flagellum armed with motor-set^, which are shown in the 

 figures given both by Czerniavski and Haswell. 



Upper Lip unequally bilobed, the apical part of each lobe furred. 



Mandibles. — The cutting plate strongly produced, divided into about five teeth, the 

 actual breadth of the plate not easy to ascertain without breaking the mandible ; the 

 secondary plate also rather elongate, apically divided into four teeth, stronger on the 

 left than on the right mandible ; the spine-row containing on the left mandible three, 

 on the right mandible two, feathered spines, in each case the one nearer the cutting- 

 plates the stouter, the hind one longer, curving backwards ; the molar tubercle strong, 

 prominent. 



Lower Lip. — The outer lobes a little dehiscent, well eiliated ; the inner lobes 

 oval, well developed, strongly ciliated ; the mandibular processes divergent, apically 

 narrow. 



First Maxillse. — Inner plate not developed ; outer plate carrying on the truncate 

 distal margin seven strongly denticulate spines and some cilia ; the first joint of the palp 

 scarcely so long as broad, the second joint long and broad, its apical margin carrying four 

 spine-teeth, of which the outermost is the longest ; there are also numerous setiform 

 spines on the surfaces, some of them of considerable length. 



Second Maxillse. — The plates small, the inner shorter than the outer, with slender 

 spines fringing the scarcely rounded apex and descending on the inner margin for a short 

 distance, and there mixing with one or two slightly feathered setae ; the outer plate 

 having the distal margin still more squared, faintly crenulate, and fringed with rather 

 stronger and longer spines, with which short ones are mixed ; one or two of the long- 

 spines might be regarded as belonging to the inner margin ; on the outer margin there 

 are a spinule and some cilia. 



Maxillipeds. — Inner plates reaching little beyond the base of the first joint of the 

 palp, narrow at the base, thence widening, the distal margin broad, indentured, sloping 

 inwards, carrying three distant spine-teeth and several feathered spines planted on or a 

 little below the margin ; the inner border straight, unarmed ; the outer border very 

 convex beyond the neck ; the outer plates not reaching the apex of the first joint of the 

 palp, small, the inner margin faintly serrate, fringed with slender setiform sbghtly 

 feathered spines, at the apex presenting an oblique emargination with a strong spine-tooth 

 at one end and a long spine at the other (the distal end); in the female the inner margin 

 showed two other emarginations below the apical, each with a spine-tooth ; in the male 

 there was one additional spine -tooth on one side of the maxillipeds. The broad distal 



