REPORT ON THE AMPHIPODA. 1059 



short space near the base ; the palm-like concavity is near the hinge of the narrow curved 

 finger, which is rather more than half the length of the hand, with a spinule near the 

 centre of the inner margin and a neither at the base of the nail. 



Second Gnathoporfs. — The side-plates very little widened distally, the apical tooth of the 

 hind margin as in the preceding pair. The branchial vesicles longer than the side-plates, 

 not quite so broad, with many transverse folds or pockets. The first joint not reaching 

 the end of the side-plate, with long setae on both margins, some of those on the lower 

 part of the hind margin being extremely long ; the second joint longer than broad ; the 

 third apically narrowed, with spines at one or two points of the lower part of the hind 

 margin ; the wrist long and narrow, with a few spines along the almost straight front 

 margin, and eight rather large groups along the serrate hind margin ; the hand narrow, 

 half the length of the wrist, with six groups of spines along the hind margin, and about 

 as many along the front ; on the inner distal surface some rows of small spines ; there is 

 no pretence of a palm ; the finger is very small, half the length of the hand, with a 

 spinule on the inner margin a little way from the inward-bent nail and two others at its 

 base ; the dorsal cilium is close to the hinge. 



First Perieopods. — The side-plates of almost even width throughout, the apical tooth 

 of the hind margin as in the preceding pairs, the lower margin without any projecting 

 fringe. The branchial vesicles longer than the side-plates, cylindrical, with transverse 

 folds. The first joint not reaching the end of the side-plate, straight, expanding a 

 little distally, furnished only with a few marginal spinules ; the second joint short ; the 

 third nearly as long as the first, the hind margin fringed with fourteen long plumose 

 setae, the front having two spinules on the upper part, and on the lower two slender spines 

 and five long plumose setae ; the fourth joint is much narrower than the third, scarcely 

 longer than broad, with half a dozen setae on the hind margin, and a seta and spinule on 

 the front apex ; the fifth joint is scarcely twice as long as the second, much wider at the 

 base than distally, with slender spines or setae along the slightly serrate lower part of the 

 convex front margin, and three feathered setae standing out from the lower half of 

 the hind margin ; the finger is slender, a little curved, very little longer than the two 

 preceding joints united. 



Second Perieopods. — The side-plates broad, with the front and hind margins almost 

 parallel, the excavation behind shallow, but forming a produced angle, the lower margin 

 slightly concave, its angles rounded, with some minute spinules near the edge. The 

 branchial vesicles like the preceding pair. The first joint not reaching the end of the 

 side plate, distally dilated, with some long marginal setae, chiefly on the lower part of the 

 hind margin ; the second joint with four plumose setae along the hind margin ; the third 

 joint longer than in the preceding pair, both margins fringed with plumose setae ; the 

 remaining joints nearly as in the preceding pair. 



Third Perasopods. — Side-plates with the front lobe deeper than the hinder one. 



