238 EEV. T. E. E. STEBBING ON THE 



two setse at the apex. Of the second antennae there remain four stout but short 

 joints, their substantial character suggesting that they may have carried an elongate 

 sequel, the fragile extension of which has caused its loss. 



The upper lip has a simply rounded margin. The lower lip has its two lobes not 

 very strongly setuliferous. The mandibles have the cutting-edge quadridentate with a 

 tridentate accessory plate and six spines on one mandible and seven spines without the 

 accessory plate on the other ; the molar is strong, the three-jointed palp well developed, 

 its terminal joint strongly curved and densely fringed with spines. The first maxillae 

 have three spines on the narrow inner plate and eight or ten on the outer ; the second 

 maxillse are distally divided into three plates, of which the inner is the largest ; on 

 each of the other two one of the spines is distinctly serrate. In the maxillipeds the 

 epipod is distally acute, the second joint has two coupling-spines, the third joint is not 

 very distinct, the fourth and smaller fifth are expanded, the sixth and seventh are 

 quite narrow. 



The first gnathopods are stouter than the second but shorter in regard to the fifth 

 and sixth joints ; the third joint is nearly as long and broad as the second ; the fourth 

 is broader than long, with a row of spines along the distal border ; the fifth narrows 

 distally and has its long inner margin fringed with thirteen unequal spines ; the sixth 

 is not half as long nor half as broad, much curved, with linear spines along the inner 

 margin ; the seventh joint continues the curve, and with its distinct but apparently 

 immovable nail is longer than the sixth joint. 



The second gnathopods have the fourth joint longer than broad, the fifth about once 

 and a half as long as the sixth, with fourteen unequal spines on its long inner margin, 

 the sixth nearly straight with five spines at intervals on the inner margin, its length 

 more than twice that of the seventh joint. The first perseopod is more slender and a 

 little shorter, with thirteen spines on the fifth joint and six on the sixth, which is not 

 twice the length of the seventh joint. The second perseopod is a slightly smaller 

 repetition of the first. Of the three following pairs of pera;opods there is unfortunately 

 little to be said, except that they are attached to the distal ends of their respective 

 segments instead of to the front as is the case with the preceding limbs. 



The first pleopods have the inner margin straight, and are closely conjoined except 

 at the apices ; the outer margin is sinuous, the last third of the plate tapering to a 

 point ; just before this narrowing begins there is seen a short, broad, inward-pointing 

 process, perhaps representing the exopod ; below this the outer margin carries a 

 microscopic fringe of six spinules, and there are one or two subapical setules. The 

 second pleopods will be best understood by the figure, the semi-oval plate being the 

 peduncle, the strongly curved and apically pointed male appendage being, as explained 

 by Dr. H. J. Hansen, the endopod, and the little adjoining excrescence the exopod. 

 These two pairs are in combination sometimes spoken of as the operculum. The third 

 pleopods here show a large branchial exopod, to which is attached a tapering two- 



