KEPOET ON THE AMPHIPODA. 1119 



behind ; the third joint widening distally, rather longer tlian the fourth, scarcely so lono- 

 as the fifth, with slender spines at several points of the hind and two or three of the front 

 margin ; the fourth joint has many slender spines along the nearly straight hind margin, 

 on the more convex front a spinule high up and a small apical group ; the fifth joint with 

 seven or eight sets of slender spines on the hind margin, a spinule high up on the 

 convex front margin, a group of slender spines below the spinule and another at the apex; 

 the finger short, not half the length of the fifth joint, with a dorsal cilium near the base, 

 and an opening on the inner side of the apex. 



Second Pcneopods. — The side-plates rather broader than in the preceding pair; the 

 branchial vesicles and marsupial plates similar; the limb also similar, with the fifth joint 

 slightly shorter and having rather fewer spines. 



Th ird Perzeopods. — The side-plates with the front lobe about as large as the preceding 

 plates, having some setas on the hinder part of the lower margin, the hind margin convex; 

 the hind lobe shallow, witli two setae at the hind corner and the hind margin rounded. 

 The limb short, easily detached ; the first joint much smaller than the side-plate, widest 

 above, the length and breadth equal, the front margin convex, with a short thick spine 

 near the top, and four or five rows of slender spines at intervals ; the hind margin very 

 convex at the upper part, with some spinules at the apex, otherwise almost unarmed; the 

 second joint with a slender spine and some spinules at the apex in front ; the third joint 

 scarcely longer than the fourth, shorter than the fifth, with some slender spines and 

 spinules at the centre of the convex front margin, a group at its apex, and somewhat 

 stouter spines at two points of the hind margin ; the fourth joint is equipped like the 

 third, both with the two following joints having, as is usual in this genus, the true hind 

 margin in front ; the fifth joint having a spinule high up on the convex front margin, 

 followed by three groups of slender spines ; on the serrate hind margin there are large 

 stout spines at four points, accompanied by seta? ; at the distal end in the cavity which it 

 forms with the very short extremely upward bent finger there are some small stout spines ; 

 the finger is sharp at the tip, and has a strongly feathered dorsal cilium at the base. 



Fourth Per&opods. — Side-plates shallow, the front lobe a little deeper than the hind 

 one. Branchial vesicles not as long or as wide as the first joint. The first joint longer 

 but narrower than in the preceding pair, the front margin evenly convex, with a spinule 

 here and there, the hind margin convex at the upper part, almost unarmed, the lower 

 part a little concave, with one or two small spines ; the second joint short ; the third 

 longer than the fourth, shorter than the fifth, with slender spines at two points of each 

 margin ; the fourth joint similarly armed, but with an additional spinule high up on the 

 hind margin ; the fifth joint with slender spines at three points of the hind margin and 

 four of the front, there being likewise some stouter spines at the apex in front ; the 

 finger short, curved, less than half the length of the fifth joint, with a feathered dorsal 

 cilium. 



