REPORT ON THE AMPHIPODA. 751 



Second Perceopods. — Side-plates very large, broader than deep, the front margin Ijut 

 little convex, the upper and lower margins roughly forming with it a very much rounded 

 triangle. The first joint not nearly reaching the end of the side-plate ; the limlj in 

 general like that of the first perseopods, the third joint with three spines on the hind 

 margin, four on the front, and an apical group. 



Third Perteopods. — Side-plates small, rather deeper behind than in front. Branchial 

 vesicles broad, broadest about the centre. First joint evenly wide, not expanded, much 

 narrower than the branchial vesicles, with spines on both margins ; the short second joint 

 with two or three spines on the front margin ; the third joint longer than the fourth or 

 fifth, not very much shorter than the first, with five or six sets of spines on the straight 

 front margin, and six spines along the convex hind margin, besides a small group on the 

 blunt, very decurrent apex ; the fourth joint with four groups of spines on the straight 

 front margin, and a spinule at the apex of the hinder margin, which is almost completely 

 overlapped by the preceding joint ; the fifth joint curved, longer than the fourth, with 

 five groups of spines in front, some spinules behind ; the finger curved, more than half 

 the length of the fifth joint. 



Fourth Perwopods. — Side-plates small, lobed behind. Branchial vesicles sharply 

 bent. First joint widely and evenly expanded, with spines at six points of the front 

 margin, and some others within the margin, the hind margin very slightly crenate ; the 

 rest of the limb resembling the preceding pair, but exceeding it in size. 



Fifth Perwopods. — Side-plates smaller than the preceding. The first joint larger 

 than in the preceding pair, not evenly expanded, the breadth contracting below, and the 

 lower lobe behind much overlapping the second joint ; the rest of the limb similar to the 

 preceding pair. 



Pleoptods. — Coupling spines very slender, much bent at the apex, with one or two 

 lateral teeth ; the peduncles narrow, the rami closely interlocked at their bases ; a single 

 cleft spine on the inner ramus ; joints of the rami numbering from ten to fourteen. 



Uropods. — Peduncles of the first pair longer than the rami, fringed with spines ; 

 the rami nearly equal, the outer a little the longer, both pectinate on the upper edge, 

 apically acute, carrying a few marginal spines ; the peduncles of the second pair equal in 

 length to the longer ramus ; the rami apically pointed, pectinate on the edges, the inner 

 ramus with four, the shorter outer with three mai-ginal spines ; the peduncles of the 

 third pair about equal in length to the ramus, carrying stout marginal sjaines ; the single 

 ramus with two spines at the apex of the broad proximal portion, the tapering nail not 

 forming quite half of the ramus. 



Telson twice as long as broad, each lateral margin at the upper part carrying four 

 stout spines, the two margins curving to an almost pointed apex with a small cilium on 

 either side of it, the surface carrying two large cilia midway between the apex and the 

 lowest marginal spines. 



