REPORT ON THE AMPHIPODA. 1039 



with half a dozen groups of seta) or spines on the front margin, many spines on the apex, 

 and eleven groups of spines on the hind margin, in character resembling the series on the 

 wrist ; the finger slender, curved, a little more than half the length of the hand, with six 

 or seven decurrent spinules along the inner margin, the nail short ; the dorsal cdium 

 spine-like, placed near the hinge. 



Second Grtathopods. — Side-plates long, widening a little below, carrying on the 

 surface some vertical streaks, the lower margin fringed and the hind margin apically 

 toothed as in the preceding pair. The branchial vesicles not very broad, but as long as 

 the side-plates. The marsupial plates shorter and much narrower than the branchial 

 vesicles, fringed with very long seta?. The first joint reaching perhaps a little below the 

 side-plate, curved, expanding distally, the front margin sinuous, with some long seta? 

 both above and below and short spines in the middle ; the hinder margin carrying 

 numerous long setae, the lower ones plumose ; the second joint with a seta in the middle 

 of the hind margin and a group at the apex ; the third joint nearly oblong, narrowing 

 apically, with a few spines along the hind margin and an apical group ; the wrist very 

 long and narrow, much longer than the hand, armed as in the first gnathopods, but with 

 the groups in front more numerous, behind less closely set, and the spines longer ; the 

 hand longer and narrower than in the first gnathopods, the margins similarly armed, the 

 inner surface closely set with rows of spines ; the finger longer than in the preceding pair, 

 but otherwise like it. 



First PersBopods. — Side-plates nearly as in the preceding pair, but with less 

 difference in width above and below. First joint not reaching the end of the side-plate, 

 a little curved and slightly expanded distally, the upper part of the hind margin bare, 

 the lower carrying long setse ; the second joint short ; the third long and broad, with 

 very long plumose setse on the lower half of the front and more than the half of the hind 

 margin ; the fourth joint scarcely longer than broad, much narrower than the third joint, 

 with many long setae on the hind margin, and two small spines at the apex of the front ; 

 the fifth joint somewhat oval, much longer than the fourth, with the long plumose setae 

 on both margins except at the proximal part, eight on the hind margin, and twice that 

 number on the front ; the finger slender, curved, with smooth edges, much exceeding in 

 length the fourth and fifth joints united. 



Second Perseopods. — Side-plates broad, with many of the vertical striations which 

 seem to occur generally on the side-plates in this genus, the front margin slightly 

 convex, the lower margin nearly straight, fringed, but not closely, with setae and spinules, 

 the excavation behind not deeper than broad, the hind margin below the prominent 

 rounded angle sloping forwards with a slight concavity, and merging without any 

 intervening tooth in the lower margin. The branchial vesicles as in the two preceding 

 pairs. The marsupial plates narrow, as long as the branchial vesicles. The limb differs 

 in some respects from that of the preceding pair ; the second joint has the hind margin 



