REPORT ON THE AMPHIPODA. 1551 



convex, hind margin pectinate and divided into six teeth, successively larger 

 to the apical; finger about half the length of the hand, with hind margin slightly 

 pectinate. 



Second Gnathopods very similar to the first, but the first joint more channelled, 

 second and third joints with few spines, the wrist much more strongly produced, with 

 three teeth on the hind margin above the apical tooth, and four on the front or inner 

 margin of the process ; the hand not reaching beyond the apex of the wrist, its hind 

 margin pectinate and divided into four teeth, successively larger to the apical ; the 

 finger less than half the length of the hand, curved, the inner margin pectinate. 



First Perseopods. — Side-plates broader than deep, produced both forwards and 

 backwards beyond the base. The first joint long and slender, bent at the upper part; 

 the second joint longer than broad ; the third and fourth joints subequal in length, 

 almost smooth; the fifth abruptly narrower but a little longer than the fourth, the 

 hind margin a little spinulous ; the finger curved, smooth, little more than a quarter the 

 length of the fifth joint. 



Second Perseopods like the first, but with the third, fourth, and fifth joints con- 

 spicuously longer. 



Third Perseopods. — Side-plates with the front lobe narrowly produced, the hinder 

 broad, and having a sort of squared process on the inner side with the lower hinder 

 angle slightly produced downwards. The first joint as long as the four following 

 together, distinguished by its great breadth, the maximum being a little above the 

 centre, the hind margin very convex, the front margin, the distal margin behind the 

 second joint, and the whole surface of the joint also convex ; the third joint longer 

 and broader than the fourth, which is in turn broader than the fifth ; the fifth 

 slender, slightly curved, rather longer than the third; the armature of all these 

 joints very inconspicuous, the sinuous distal margins of the fourth joint finely pectinate 

 on the inner and outer sides of the limb ; the finger not a fourth of the length of the 

 preceding joint. 



Fourth Perseopods. — The side-plates with the front lobe not produced forwards, 

 much shallower than the hind lobe. The first joint very little longer than in the 

 preceding pair and not so broad, the front margin nearly straight, with some slight 

 serration and a few small spinules, the lower angle rounded and the distal margin in 

 front of and below the second joint broad and almost flat, while the convex hind margin 

 does not reach to the end of the second joint ; across the top of the second joint there 

 is an inner surface margin, distally straight, with a small rounded lobe behind ; the third 

 joint is longer and broader than the fourth, not apically produced, strongly pectinate 

 along the front margin and front part of the distal margin ; the fourth joint is armed 

 in like manner, and with pectination also at the apex of the hind margin ; the fifth 

 joint straight, slightly tapering, narrower than the fourth, almost as long as the third, 



