REPORT ON THE AMPHIPODA. 897 



broader and longer. The limbs of this and the following pairs robust, not feeble like the 

 gnathopods. The first joint not reaching beyond the side-plate ; the second joint short, 

 the third longer than the fourth, with spines at four points of the hind margin, the front 

 margin apically acute and a little decurrent ; the fourth joint with spines at three points 

 of the hind margin, distally widened, and apically acute in front ; the fifth joint about as 

 long as the third, with spines at four points behind and at two or three in front ; the 

 finger more than half the length of the fifth joint. 



Second Perasopods. — The side-plates with the front margin convex, produced below 

 the preceding pair in a sharp apex, the hind margin concave in two curves separated by 

 a sharp process, the lower curve being much the longer. 



Third Perseopods. — Side-plates bilobed, the hinder lobe the larger, its hind margin 

 forming two large processes, of which the upper is the longer and narrower, curving down- 

 wards. The first joint of the limb long, with the front margin nearly straight, apically 

 forming a small sharp tooth, the hind margin deeply cut into five acute, large, unequal 

 teeth or processes, of which the lowest is the smallest ; the second joint short, the front 

 margin apically produced into a sharp tooth ; the third joint with one or two spines on 

 the front margin, the hind margin produced in a long, very acute, decurrent apex. The 

 rest of the limb missing. 



Fourth Perteopods. — The side-plates broader than the preceding pair, not bilobed, 

 the hind margin produced into two very long, narrow processes. The first joint like that 

 of the third perseopods, but larger and with larger processes ; the second and third joints 

 also a little longer ; the fourth joint short, with spines at three points in front, widened 

 distally, the hind margin apically acute, almost entirely overlapped by the decurrent 

 apex of the third joint. The rest of the limb missing. 



Fifth Per&opods. — Side-plates similar to those of the preceding pair, but of the hind 

 processes the upper is larger and much more produced than the lower. First joint of 

 the limb not unlike that of the fourth perseopods, but much larger, the uppermost 

 process of the hind margin small, with an extra denticle on the top of it, the process next 

 below and the process lowest but one being both very much produced ; the third joint 

 longer than in the preceding pair, with spines at three or four points on the hind margin ; 

 the fourth joint longer than in the preceding pair, having a little spine within the slightly 

 produced acute hinder apex ; the fifth joint longer than the fourth, not quite so long as 

 the third, slightly curved, with spines at four points of the front, and three or four of the 

 hind margin ; the finger not half the length of the fifth joint, rather broad, curved at the 

 nail, with a dorsal cilium close to the hinge, another at the base of the nail, and four 

 spinules along the convex hind margin. 



Uropods. — Peduncles of the first pair a little longer than the rami, armed with 

 marginal and apical spines ; the rami long and slender, subequal, with spines on both 

 margins, and each ending in a small nail ; the peduncles and rami of the second pair 



(ZOOL. CHALL. EXP. PART t-XVII. 1887.) XxX 113 



