REPORT ON THE AMPHIPODA. 1189 



fourth, subequal to the fifth, widening distally, with a group of rather long spines on the 

 somewhat decurrent hinder apex, and smaller spines at three points of the hinder and 

 four of the front margin ; the armature of the fourth joint similar; the fifth joint with 

 spines at five points on each margin, the front ones the stronger, and, as on the preceding 

 joint, a little curved towards the margin ; the finger about three-quarters as long as the 

 fifth joint, at first straight, distally curved, with a short sharp nail, hairs along the hind 

 margin, and a dorsal cilium close to the hinge. 



Fourth Perseopods. — Side-plates as in the preceding segment, but rather smaller. 

 The limb like that of the third perseopods, but longer, and with the first joint rather 

 wider. 



Fifth Perseopods. — Side-plates not bilobed ; the limb like that of the fourth perseo- 

 pods, but with the first joint rather larger. 



Pleopods slender ; coupliug spines stout, a little bent, with two pairs of retroverted 

 hooks, the pair below the apical being the larger ; the cleft spines appear to be a series 

 of five on the first pair, of three on the second and third ; the joints of the rami 

 numbering from eleven to thirteen. The figure plp.sp. shows two of the coupling 

 spines of one peduncle interlocked with one from the peduncle of the opposite side. 



Uropods. — Peduncles of the first pair about as long as the inner ramus, having five 

 spines on one of the upper margins, and a longer spine on the lower apex ; the outer 

 ramus normally shorter than the inner, but on one side of the specimen figured nearly 

 equal to it ; the proportions seem to be not quite constant ; both rami have spines on the 

 margins and an apical group ; the inner ramus has a dozen spines on the inner margin, 

 five or six on the outer, a long and short one at the apex, with two of more equal length 

 above, this arrangement of the apical group applying to both rami in this and the 

 following uropods ; peduncles of the second pair much shorter than the inner ramus, the 

 outer ramus shorter than the inner, both with marginal and apical spines ; the third 

 uropods resembling the bowl of a spoon, with the cavity turned towards the telson, 

 beyond which they project a little, the margin set round with six or seven spines, of 

 which the inner are somewhat setiform. 



The Telson scarcely longer than broad, with a narrowly rounded end, at a little 

 distance from which, on either side, is a group of three small cilia ; on the upper surface, 

 at about the middle, begins a bluntly conical, minutely furred projection, not reaching 

 quite to the distal margin, carrying two prominent spines on the upper margin of its 

 apex. 



Length. — The length along the back of the pera?on and first two segments of the 

 pleon, of the specimen which supplied figure D, was two-fifths of an inch. 



Locality. — Nine specimens, including males and females, were obtained at Kerguelen, 

 some, probably all, from Station 149h; off Cumberland Bay; Jan. 29, 1874; depth, 

 127 fathoms ; bottom, volcanic mud. 



