REPORT ON THE AMPHIPODA. 935 



base, its inner margin cut into many adpressed teeth from base to nail ; the nail pro- 

 jecting just beyond the palm, closing down between two rows of thick strong spines, of 

 which the largest are innermost. 



Second Gnathopods. — Side-plates small, oblong, a little longer than in the preceding 

 pair, but distally rather narrower. Branchial vesicles oval or flask-like, broader below 

 than above, about as long as the first joint. The limb closely resembling the first 

 gnathopods in shape and armature ; the first joint a little longer, the hand considerably 

 longer, with six groups of spines on the hind margin. In the female specimen the 

 gnathopods were slighter, especially as regards the hand, which in the first pair did not 

 exceed the length of the first joint, in the second was shorter than it. Marsupial plates 

 much longer than the first joint. 



First Perseopods. — Side-plates rather longer and broader than the preceding pair. 

 Branchial vesicles similar in shape, rather larger. Marsupial plates long and broad, the 

 distal margin carrying nine or ten setas. First two joints like those of the preceding 

 pair ; third joint rather longer than the fourth, with a very few spinules on the margins, 

 of which the front one is slightly decurrent ; the fourth joint spined at three points of 

 the hind margin ; the fifth joint longer than the third, slightly curved, with spines at 

 five points of the hind margin ; finger curved, considerably more than half the length of 

 the fifth joint. 



Second Perasopods. — Side-plates broader and longer than the preceding pair, excavate 

 behind, the margin below the excavation sloping forwards to the lower margin. The 

 first three joints of the limb as in the preceding pair ; the rest missing. 



Third Perseopods. — Side-plates with the hind lobe deeper than the front. The first 

 joint little expanded, but rather wider above than below, its length twice its breadth ; 

 front margin nearly straight, with some small groups of spines, hind margin scarcely less 

 straight, slightly serrate ; second joint very short, partially overlapped by the hind lobe 

 of the first ; third joint rather broader and a little shorter than in the second perseopods, 

 decurrent behind. The rest of the limb missing in this and the two succeeding pairs. 



Fourth Perseopods. — Side-plates bilobed, the hinder lobe the deeper. Fig. prpA. 

 represents the side-plate alone without its appendages. The limb like the preceding, 

 but with the first and third joints longer. 



Fifth Perseopods. — Side-plates with a single lobe. Branchial vesicles small. First 

 joint like the preceding, except that it is larger, and that it is more expanded at the top 

 than below ; the second and third joints resemble those of the preceding pair. 



Pleopods. — Coupling spines very small, with three or four retroverted teeth along 

 each of two edges ; cleft spines apparently only three or four in number, with long 

 unequal arms ; joints of the rami numbering about thirteen or fourteen. 



Uropods. — Peduncles of the first pair longer than the outer, shorter than the inner, 

 ramus ; the rami both long, pointed, with small spines on the margins ; peduncles of the 



