REPOET ON THE AMPHIPODA. 667 



usual, of those in frout faces backwards, of those behind forwards ; the palm is defined 

 by two stout spines, beyond which it forms a pectinate convexity, over which the small 

 finger closes ; the finger thick at the base, has a long inner tooth, near to which the 

 margin is pectinate, and two or three cilia are placed ; the dorsal cilium is nearer the 

 base than the nail. 



First Perwopods. — The side-plates are abruptly larger both in length and breadth, 

 exceeding in size those of the two preceding segments united ; they are much dilated 

 below and rounded, with some small spines where the lower curves round to the hinder 

 margin ; the first joint massive, projecting beyond the side-plate, its hinder margin 

 convex, with spines on the lower half; third joint broad, a little decurrent in front, much 

 longer and larger than the fourth joint ; there are some long and short spines on the 

 hind border of both the third and fourth joints, as well as on the apex in front ; the fifth 

 joint equal in length to the third, somewhat curved and tapering, its distal rim 

 microscopically pectinate ; six groups of spines on the hinder margin, the pair at the 

 finger-hinge showing oblicjue striae ; some spiuules on the convex front margin ; the 

 finger small, unarmed, except for a small dorsal cilium. 



Second Perseopods. — Side-plates very broad, little excavate, nearly as broad as deep. 

 The joints of the limb closely resembling those of the preceding pair. 



Third PeneojMds. — Side-plates much broader than deep, fully as broad as those of 

 the preceding pair. First joint about as broad as long, with a rounded lobe in front 

 raised upwards, and the hinder lobe drawn downwards beyond the second joint ; the 

 front margin much spined, the hinder serrate ; the third joint not much dilated, a little 

 decurrent behind, subequal in length to the fourth and shorter than the fifth joint, 

 like those two in having spines on both margins, and several groups of them on the front 

 margin ; finger slender, not half the length of the fifth joint. 



Fourth Perseopods. — The first joint with its front margin sinuous, a little contracted 

 before reaching the lower hinder lobe; the last four joints similar to those of the preceding 

 pair, but rather longer. The inner margin of the finger was observed in this pair to be 

 finely pectinate. 



Fifth Perxopods. — The first joint considerably longer and a little broader than that 

 of the preceding pair, the other joints veiy similar to those of the pair just mentioned. 



Pleopods. — Peduncles broad and long ; the two coupling spines long, having from 

 four to five retroverted teeth ; by the side of these coupling spines are three pointed 

 spines, two of them feathered ; the cleft spines are six in numljer in the first pair, five in 

 the second and third pairs, as usual increasing in size successively downwards, the spoon- 

 shaped part running out nearly as far as the serrate part, the shafts thickly plumose. 

 The joints of the rami number from twenty-one to twenty-three. 



Uropods. — The first pair not reaching so far back as the second, the peduncles longer 

 than the rami, the rami subequal, rather deeply notched for the few lateral spines ; 



