REPORT ON THE AMPHIPODA. 1041 



Fifth Perasopods. — Side-plates shallow and not very broad, with two setse and a 

 small spine on the convex lower margin ; at the narrow line of attachment, both in this 

 and other species of the genus, these side-plates seem to be almost coalesced with the 

 segment. The first joint with the front margin nearly straight, carrying nine spinules 

 and an apical spine ; the lower margin, after passing across the top of the second joint, 

 abruptly descends along the back of it, but before reaching the end curves up again, and 

 with a slightly convex course, closely fringed with long plumose setae, makes an obtuse 

 angle with the slightly convex, backward-tending, smooth hind margin, the greatest 

 breadth of the joint being at the angle ; on a large part of the inner surface of this great 

 wing there are long setae ; the second joint with the sides almost parallel, the front 

 margin a little decurrent, with an apical spine, and two spinules ; within the apex 

 there are three spinules on the lower margin ; the third joint is shorter than the second, 

 especially behind, where it has two or three long setae and two or three spines ; in front 

 its apex is decidedly decurrent, set about with three or four slight spines ; the fourth joint 

 is longer than the third, shorter than the second, widening distally, the apex behind 

 slightly decurrent, carrying a spine ; the apex in front more decurrent, with several 

 spinules on the lower margin within the apex ; the fifth joint is nearly as long as the 

 three preceding joints united, broader above than below, the front and hind margins 

 slightly convex, smooth, the lower margin obliquely truncate, the surface having some 

 short submarginal spines and some spinules difficult to discern, and there are some at the 

 apex ; the finger is much narrower, but with something of the same laminar appearance, 

 and about three-quarters of its length, lanceolate in shape, with very little firmness of 

 texture ; there is a small seta near the hind margin below the middle. 



Plcopods. — The coupling spines broad at the base, having a lateral tooth much 

 stronger than the apical on one side, and on the other a succession of small teeth ; the 

 peduncles have also groups of long plumose setae ; the inner ramus of the first pair has 

 on its long first joint a plumose seta followed by six cleft spines, with the outer arm 

 clearly serrate on the inner edge ; this joint has also four plumose setae below the cleft 

 spines ; there are twenty-eight joints on the outer ramus of this pair, and twenty-two on 

 the inner. 



Uropods. — The peduncles of the first pair are shorter than the rami, with small spines 

 along the upper margins, the rami are slender, reaching little beyond the peduncles of the 

 second pair, the outer rather the shorter, each curving to the acute apex, the inner carrying 

 a few spinules on the margins high up, and some minute surface spines ; the peduncles of 

 the second pair nearly as long as the rami, with spines along the upper margin ; the 

 inner ramus rather longer than the outer, with thirteen spines along the serrate upper 

 margin, which is apically curved and acute ; the outer ramus has sixteen spines on the 

 serrate upper margin of the outer surface, and side by side with these on the inner surface 

 another row of eleven or twelve, more decurrent, the last five long, and with the apical 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 131 



