REPORT ON THE AMPHIPODA. 663 



First Perseopods. — Side-plates very small ; first joint about as long as in the 

 preceding pair ; third and fourth joints subequal in length, third rather the stouter, 

 with the front margin curved ; fifth joint longer, Imt more slender than fourth, spines on 

 these joints few and small ; no dilated palm on the fifth joint, a pair of spines at its 

 junction with the curved, pointed finger. 



Second Perieopods. — Side-plates very narrow at base, curving forwards so as to hide 

 much of the three preceding side-plates, almost the whole of that of the third segment, 

 deeply excavated behind so as on the whole to have the shape of an irregular collar ; 

 the leg similar to the preceding. 



Third Pergeopods. — Side-plates large, broad at base, widened below ; the first joint 

 projecting from the anterior part of the side-plate and tending to bend back underneath 

 it, its front margin then forming a great forward-projecting knee, while the hind margin 

 is cut into seven sharp, decurrent teeth, and below these produced into an enormous 

 process, sharply pointed, extending down almost to the base of the finger ; the second 

 joint is as usual very small, the third and fourth subequal in length ; the fifth much 

 longer than eitlier, though shorter than the two combined ; finger curved, equal in 

 length to the third joint. 



Fourth Perwopods. — Side-plates rather large, though much smaller than the pre- 

 ceding pair ; the first joint with front margin almost smooth, and, except at the top, 

 straight ; the joint, wide at the base, narrows so much below as to become almost 

 triangular; it is produced halfway down the third joint by the hinder margin, which is 

 cut into fourteen teeth ; the third joint stouter and a little shorter than the fourth, 

 which bears similar relations to the fifth ; spines on both margins of these joints ; the 

 finger somewhat longer than in the preceding pair. 



Fifth Perseopods. — Side-plates rather smaller than the preceding pair, rather deeper 

 behind than in front ; first joint long, front margin straight, hind margin cut into 

 twelve or thirteen teeth, which form a gentle curve overlapping the third joint, but not 

 so far down as the middle of it ; second joint very short ; third a little dilated above, 

 longer than the fourth, shorter than the fifth ; spines on the borders of all three ; 

 finger short, but straight, sharply pointed. 



Pleopods. — The stout coupling spines near the infero-anterior angle of the peduncle 

 were seen, but whether their structure was precisely as in Cyphocaris micronyx could 

 not be determined ; the rami consist of some eight to ten joints ; the cleft spines on the 

 first joint of the inner ramus are three in number, increasing in size successively 

 downwards. 



Uropods similar to those of Cyphocans micronyx, but the rami with fewer spines, 

 the outer and inner of each pair nearly equal in length. 



Telson similar to that of the preceding species, except that no spines were discerned 

 upon it except one in each apical cleft. 



