REPORT ON THE AMPHIPODA. 841 



joint of the palp very short, the second very long, gradually expanding so that the 

 widest part is near the distal end, the outer margin smooth, the inner thickly set with 

 setae or setiform spines, a few also on the surface at the upper part ; the third joint 

 longer than the first, expanding distally, the inner margin straight and unarmed, the 

 outer margin, one surface and the apex thickly set with spines ; the finger short, its 

 inner margin straight, produced a little beyond the base of the very shprt nad, one or 

 two cilia being here inserted ; the dorsal cilium rather nearer the base of the finger than 

 that of the nail. 



First Gnathopods. — Side-plates narrow at the base, greatly expanded below and 

 forwards, the lower margin convex, serrate at the corners, fringed all round with setae 

 of very various lengths ; some spines on the hinder margin ; the first joint reaching 

 considerably beyond the side-plate, with long setae on both margins, the second joint 

 short, the third rhomboidal, with the distal end emarginate and the hinder apex a little 

 produced and fringed behind with long spines ; the wrist as long as the hand, becoming 

 distally very wide, the free hind border fringed with numerous spines, of which the 

 longest are at the slightly produced free apex ; the hand long and broad, widest at the 

 palm, the front margin longer than the hinder ; the palm convex, defined by a tooth in 

 which is set a strong spine with plumose accessory thread ; there are numerous setae of 

 difi"erent lengths set round the palm, some grouj^s also on the inner surface near both 

 lateral margins and at the front apex ; the finger fitting closely to the palm and when 

 closed reaching the inside of the tooth which defines the palm ; a dorsal cUium not very 

 close to the base of the finger ; a small caj) over the nail. 



Second Gnathopods. — The side-plates furnished like, but much narrower than, the 

 preceding pair, not expanded, all the lower margin serrate. Marsupial plates with very 

 long setae. The limb very simUar to the first gnathopods but more elongate, the first 

 joint stretching far beyond the side-plate ; the third joint more narrowed distally, with 

 its hinder apex less produced than the other ; the wrist and hand both longer than in 

 the preceding pair, but not quite so wide distally, armed in the same manner, the 

 extreme length of the wrist scarcely equalling that of the hand. 



First Peraeopods. — Side-plates longer and broader than those of the preceding segment. 

 Branchial vesicles narrow at the base, widening to the distal end, longer than the side- 

 plates. Marsupial plates narrow, rather longer than the branchiae, with long setae. First 

 joint reaching beyond the side-plate, a little expanded distally in front, carrying some 

 long setae on its margins ; third joint widening a little distally, not decurrent, with 

 several groups of setae on the hinder margin and an apical group in front. 



Second Perseopods. — Side-plates very much broader than the preceding pair, also 

 longer, longer than their own breadth ; the angle of the hind margin is so low down as 

 scarcely to be suggestive of an excavation ; from this angle the fringe of sette extends all 

 round the lower margin, which bends upwards in front so as to be scarcely distinguishable 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 1C3 



