REPORT ON THE AMPHIPODA. 1071 



vesicles small, oval. Marsupial plates short and narrow, longer and narrower than the 

 branchial vesicles, with half a dozen setae. The first joint of the limb much smaller 

 than the side-plate, much dilated, broader below than above, fully as broad as long, with 

 the margins almost unarmed ; the second joint short, not longer than broad ; the third a 

 little longer than the second, and the fourth than the third, all three with the front 

 margin convex, and some apical spinules, the fourth with a long straight spine on the 

 hinder apex ; the fifth joint much narrower than the fourth, almost as long, the front 

 margin convex, with an apical spine and spinules, the hind margin tending to concave, 

 with a setule at the centre, a strong spine at the apex, accompanied as in the preceding 

 species by a much shorter one ; against these the minute finger bends upwards and 

 backwards, it is very thick at the base, with a small dorsal cilium, and a strong dorsal 

 denticle, the apical part beyond the denticle being comparatively narrow. 



Fourth Perasopods longer than the third. Side-plates small. Branchial vesicles 

 narrow, shorter than the first joint. The first joint as long as in the thnd perseopods, 

 but not so broad, wider above than below, the margins carrying a few setules ; the rest 

 of the limb like that of the preceding pair, except that the joints are more elongated, and 

 the fifth decidedly shorter than the fourth ; the finger is produced to a very sharp apex. 



Fifth Pevzeopods very little longer than the fourth. The first joint a little longer, 

 but narrower than in the preceding pair, most narrowed at the junction with the second 

 joint ; the second joint longer than broad ; the third longer than the second, the fourth 

 scarcely longer than the third, each of these two with a spine on the hinder apex ; the 

 fifth longer than the fourth, with a group of slender setae on the apex of the convex 

 hind margin, two small setules and a small apical spine on the straight front margin ; 

 the finger curved, half the length of the fifth joint, with a strong dorsal cilium close to 

 the hing-e, and a small dorsal denticle over the base of the nail. 



Pleopods. — The coupling spines very small and slender, curved, with apparently two 

 lateral retroverted hooks below the apex ; the peduncles have also many long setae. I 

 have not been able to discover any cleft spines ; the joints of the rami number from 

 seven or eight to nine. 



Uropods. — The peduncles of the first pair are much longer than the rami ; the outer 

 ramus is rather shorter than the inner and has a series of five spines beginning above 

 the middle of the outer margin, and a stronger spine at the blunt apex ; the inner 

 ramus has a like apex and two or more distant spines on the inner margin ; the 

 peduncles of the second pair are slightly longer than the inner ramus, which has four 

 spines along the inner margin and a strong apical spine flanked by two small ones ; the 

 outer ramus is considerably shorter, with a similar apex, and two spines on the side. 

 The peduncles of the third pair are a little longer than the outer ramus, which does 

 not reach back so far as the rami of the other two pairs ; it is sbghtly curved, tapering 

 distally to the short second joint, which is tipped with a long spine ; the inner ramus is 



