622 THE VOYAGE OF H.M.S. CHALLENGEE. 



tapering, considerably longer than the other seven together, having the cylindrical hairs 

 of the brush not very long, and carrying two spines at, and one spine near, the apex ; 

 the other joints diminishing successively in breadth, and towards the end in length also ; 

 the secondary flagellum of four joints together equal in length to the first of the primary. 



Loiver Antenna. — Gland-cone prominent, third joint somewhat inflated, in length 

 equal to the composite first and second joints, fourth and fifth subequal, both with small 

 cilia above and sette l^elow ; the flagellum tapering, probably consisting of seven or eight 

 joints; in the specimen (female) examined there were five left on one member of the 

 pair and six on the other. 



Mandibles. — The cutting edge smoothly convex, bounded by a very small tooth 

 above, pointed downwards, and an equally small one below pointing forwards ; above this 

 in the left mandible is a minute tubercle breaking the evenness of the convex edge, but this 

 is probably only an individual peculiarity ; the top border over the upper tooth is minutely 

 serrate ; the secondary plate of the left mandible is short and small, dilated forwards and 

 apicaUy cut into five or six minute denticles ; the spine-row consists of three slender spines ; 

 the molar tubercle is prominent, the dentate crown pointing backwards, oval, with three 

 central teeth apart from the lines of denticles ; the region between the spine-row and the 

 crown furred with cilia, a long group of these also above the crown ; the palp not far back, 

 over the molar tubercle's front part, the first joint short, the second with nine spines 

 near the apex ; the third joint with the first subequal in length to the second ; more than 

 the first third of its inner margin smooth, the remainder fringed with fifteen spines ; one 

 spine near the base on the outer side. Behind the palp and molar tubercle the shaft of 

 the mandible is broad. 



First Maxillae. — Inner plate short and narrow, with two unequal plumose setae on 

 the apex ; outer plate long, two of the spines a little below the apical margin, the inner 

 of the two with fifteen rather elongate teeth, the other spines much crowded together, 

 nine in number, strong, the outer less dentate than the inner, the longest of all in 

 company with a short one standing nearest to the two first mentioned ; the second joint 

 of the palp narrower proximally and distally than in the middle, its apical border set 

 with seven spine-teeth serrate on the outer border, a single seta near the outer apex. 



Second Maxillfe. — Outer plate longer and broader than the inner, apical margin 

 oblique, with pectinate spines increasing in length to the apex on the outer side, a few 

 shorter ones following down the outer border ; apical border of the inner plate likewise 

 oblique, armed with spines, a plumose seta on the inner margin just below the spine-row 

 longer than any of the spines. 



Maxillipeds. — Inner plates not reaching the apex of the first joint of the palp, with 

 plumose setse planted in the ordinary manner on the inner margin and passing across to the 

 outer corner of the apical ; apical border with three strong teeth, the innermost the most 

 prominent, beyond these a plumose spine or seta distinct from the series just mentioned ; 



