REPORT ON THE AMPHIPODA. 757 



the upper five very small, the lower rather larger, the lowest but one flat-topped, 

 perhaps accidentally ; the secondary plate similar with fewer teeth, but neither were these 

 nor the spine-row well made out ; the palp with the first joint short, 3ret nearly as 

 long as the third, the second joint long, with setse on the upper part ; the conical third 

 joint with two apical setse. The opposite mandible probably with the usual difterences. 



Loiver Lip. — Mandibular processes apicall}^ rounded. 



First Maxillai. — Inner plate small, elliptical ; outer plate strongly ciliated on the 

 inner edge, the truncate distal margin carrying five spines, the two innermost long and 

 slender, with a very short one submarginal by their side, the third slender, the fourth 

 much stouter, the fifth the slenderest of all, these latter three being shorter than the 

 first two ; the palp, which is certainly two-jointed, has five spinules on the dentate 

 oblique apical margin, and two setse on the surface, of the second joint. 



Second Maxillse. — The inner plate shorter than the outer, with five or six slender 

 spinules and spines distributed upon the inner and apical margins ; the outer plate 

 having about nine spines, chiefly on the rounded apex. 



Maxillipeds. — The inner plates reaching halfway along the inner margin of the 

 following joint, the apical margin sloping a little outwards and carrying two setules, the 

 inner shorter than the outer ; the second joint produced on the inner side into a small 

 rudimentary plate with a seta at its apex ; five or six more small setse are distributed 

 on or near the rest of the margin ; the first and second joints of the palp are sul^equal, 

 together scarcely longer than the preceding joint ; the third joint rather longer than the 

 second, armed like the two preceding joints with a few slender setse or spines, and having 

 the distal margin ciliated and produced over the base of the finger ; the finger long, 

 rather broad at the base, but rapidly narrowing, strongly ciliated or spined on the inner 

 margin. 



First Gnathopods. — The side-plates small, almost concealed by the following pair, 

 the Mnd margin longer than the front, the lower oblique. The first joint attached at 

 the lower extremity of the side-plate, subequal in length to the hand and wrist united, 

 the front margin fringed witli setre, of which there are also a very few on the hind margin ; 

 the second joint has two apical spines behind ; the third joint much longer than broad, 

 narrowing to the blunt apex, which carries a group of spines, much of the hind margin 

 furred; the wrist not quite so long as the hand, distally squared, the hind margin much 

 shorter than the front, fringed with a few bent spines ; some spines also on the surfaces, 

 especially the inner ; the front margin of the hand much longer than the hinder, the 

 long, very oblique, finely pectinate palm defined by a pair of spines at the widest part 

 of the hand ; these are reached by the point of the long finger, which closes over a series 

 of spinules and a second pair of spines ; there are a couple of setse on the hind margin, 

 four or five crossing the inner surface diagonally, and others near the front margin, of 

 which one pair are long ; the dorsal cilium of the finger is near the base. 



