REPORT ON THE AMPHIPODA. 823 



Third Per^ojjods. — The side-plates almost concealed under those of the preceding 

 segment. The first joint not expanded, the margins almost parallel, seven small setae 

 along the front, and a tuft of longer ones at its apex ; second joint short, with setse in 

 front ; the tliird, fourth, and fifth subequal in length, the fourth rather shorter than the 

 other two, intermediate in breadth, all three armed on both margins with groups of setse 

 and spines ; the fifth joint somewhat tapering, its apical spines not so long as the 

 slender, slightly curved finger, which is more than half the length of the fifth joint ; 

 several of the setse on this limb are very long and plumose, especially at the back of 

 the fourth and fifth joints. 



Fourth Peraso2wds very much longer than the third or fifth. The first joint 

 broadest above, armed all round the convex front inargin with setse and spines, the 

 hinder margin smooth, lobed above, then straight or slightly concave ; a ^^ocket is 

 marked in the surface of the integument at the upper part in front ; the second joint 

 short ; the third long, straight, with spines on both margins, those at the apex strong, 

 and the hinder ones also long ; the fourth joint rather longer and narrower than the 

 third, similarly armed, its hinder margin very slightly concave ; the fifth joint slender, 

 longer than the preceding, its hind margin rather more concave, carrying some long 

 setse, the front margin correspondingly convex, fringed with slender spines of difierent 

 lengths, the finger very slender, long and straight; in one specimen, apparently belonging 

 to this species, the finger is as long as the preceding joint. 



Fifth Peraeopods. — The first joint greatly expanded, and Ijehind outdrawn much 

 below the second joint ; the front border comparatively short, fringed with spines, the 

 lower part of the hind border serrate, and the lower border also serrate but in the opposite 

 direction, spiny cilia in the serratures ; the second joint comparatively large, with the 

 front margin very convex, and having its lower half fringed with spines which at the 

 apex are very long ; the third joint longer and much stouter than either tlie fourth or 

 the fifth, with long spines on much of the front, and on the lower part of the hind 

 margin, one on the hind apex being longer than the fourth joint ; the fourth joint 

 shorter and broader than the fifth, spined at three points in front, and at two behind, 

 one of the apical spines as long as the fifth joint, which is spined in a similar manner, 

 and has an apical spine nearly as long as the finger ; the finger slender, nearly straight, 

 subequal in length to the fifth joint, which has some pectination on the apical margin. 



Pleopods. — A row of five set^ was observed on the peduncle at about the centre, 

 the two coupling hooks were also seen to be round-headed, bent so as to form a sharp 

 strong hook, seemingly without other dentation ; the cleft spines were three in number 

 on the one pleopod examined; the joints of the inner ramus being twelve, those of the 

 (juter fifteen in number. 



Uropods. — Peduncles of the first pair somewhat longer than the rami, fringed with 

 spines of various lengths, the longer above, at the apex carrying one very stout spine 



