REPORT ON THE AMPHIPODA. 1067 



middle five in number. The second joint is short, with an apical spinule, the third is 

 long and broad, the hind margin smooth and nearly straight, the front convex, fringed 

 with groups of long slender spines, the largest group being on the rounded apex ; the 

 fourth joint is of a similar shape, but much narrower, and only half the length ; it has a 

 few spines at each apex ; the fifth joint is longer and much narrower than the fourth, 

 slightly curved, tapering distally, with some spines at the middle and apex of the front 

 margin, and a spinule at each of three points on the hind margin ; the finger is narrow, 

 curved, more than half the length of the fifth joint, with a small dorsal cilium near the 

 hinge. 



Second Perseopods. — Side-plates like the preceding pair, perhaps a little broader, as 

 those are than the pair preceding ; not excavate behind. The limb nearly the same as in 

 the first perseopods. 



Third Perseopods. — The side-plates broad, the front lobe less deep than the preceding 

 pair, but of the same pattern, the hind lobe small. The branchial vesicles small, a narrow 

 oval in shape. The marsupial plates narrower than the branchial vesicles, about as long, 

 with six or seven setae. The first joint of the limb much broader above than below, the 

 upper part of each margin convex, the lower nearly straight, with few spines or setae ; the 

 second joint short, its front margin like that of the three following joints convex, apically 

 tipped with a setule ; the third joint rather longer than the fourth and slightly broader, 

 the hind margin straight, the fourth joint with a group of long spines at the apex of the 

 straight hind margin ; the fifth joint as long as the third, narrower than the fourth, the 

 hind margin a little concave, the apex carrying a short spine and one or two long ones ; 

 the finger minute, sharply upturned, with a dorsal denticle. The last two joints, and 

 perhaps the last four, in this parr of legs may be regarded as retroverted, facing, that 

 is to say, in a direction opposite to that of the first two joints. 



Fourth Perseop>ods. — Side-plates small. The lirnb similar to the preceding pair, but 

 all the joints more elongate, particularly the third, fourth, and fifth ; the first joint is a 

 little "more regularly narrowed towards the distal end, with the margins gently convex ; the 

 minute and upward-curved finger has a small tooth on the inner margin at the base of the 

 nail, the dorsal denticle is very distinct, and there is a small dorsal cilium near the hinge. 



Fifth Perseopods. — Side-plates small. The limb much more elongate than that of 

 the preceding pair ; the first joint not much dilated or especially at any one part, the 

 front margin for the most part straight and smooth, the hind margin jutting out a little 

 at the upper corner, the rest convex, carrying a few spinules ; the third joint straight, 

 longer than the fourth, but a good deal shorter than the fifth ; the long fifth joint has 

 two small groups of spines on each margin towards the distal end ; the finger is slender, 

 little curved, less than half the length of the fifth joint, ending in a minute nad. 



Pleopods. — The coupling spines very small, curved, with a pair of lateral teeth similar 

 to the flukes of the apex just beyond them ; on some of the peduncles there were long 



