KEW BEITISH AMPHIPODA. 35 



second joint of the palp, fringed with eight or nine spine-teeth; the second joint of 

 the palp the longest, not very strongly spined. 



First gnathopods. The side-plates, like the somewhat larger second pair, oblong, 

 directed forwards. The first joint of the limb a little widened distally, carrying a few 

 slender spines ; the second joint having some slender spines at the apex of the hind 

 margin ; the third joint more or less oblong, with five spines on the lower part of the 

 hind margin ; the wrist not twice as long as the hand, furry on both margins, the hind 

 margin being also fringed with spines; the hand broadest near the base, the front 

 regularly convex, with spines at the apex, the hind margin convexly angled, carrying a 

 few partially pectinate spines, the surface of the hand furry ; the finger about half the 

 length of the hand, broadest at the base, with spines at the centre, where at the inner 

 margin it abruptly narrows. 



Second gnathopods. The first joint longer than in the first pair, with a few feathered 

 spines or setae on the hind margin ; the wrist and hand longer than in the first pair; 

 the wrist twice as long as the hand, slender, furry, and carrying a few spines ; the hand 

 also slender, furry, with an oblique row of spines on the distal part ; the finger much 

 curved, about a third the length of the hand. 



Fbst ])er(eopods. Side-plates longer than the preceding pair, distally widened. 

 Branchial vesicles about equal in length and breadth to the side-plates, but with 

 curved margins. The limb slender, the first joint reaching a little below the side- 

 plate, the third joint with convex front margin, shorter than the fourth, which is 

 straight and armed on the hind margin with a few spinules; the fifth joint rather 

 longer than the third, shorter than the fourth, with spinules at four points of the hind 

 margin ; the finger curved, about half the length of the preceding joint. 



Second jierceopods. The side-plates with convex front and lower margin, the hinder 

 excavate. Branchial vesicles and limb as in the preceding pair, but the fourth joint 

 more elongate. 



Third permopods. The side-plates longer than deep, only slightly bilobed. The first 

 joint narrowly oval, slightly serrate, the third wider but shorter than the fourth, the 

 fourth than the fifth, each of the three having small spines at three or four points of 

 each margin ; the finger slender, nearly straight, more than half the length of the 

 fifth joint. 



Fourth perceopods. The side-plates with the length and depth equal. The limb 

 similar to the preceding pair, but with the third, fourth, and fifth joints much longer; 

 and the finger about half the length of the preceding joint. 



Fifth perceopods. The side-plates very shallow, longer than deep. The broadly oval 

 first joint longer and much wider than in the two preceding pairs, the third joint larger 

 than in the preceding pair and more produced downwards behind, the remainder of the 

 limb similar to that of the fourth pair. 



Pleopods. The two coupling-spines long and slender, serrate on each side, with two, 



f2 



