REPORT ON THE AMPHIPODA. 737 



succession of groups of spines, the outer surface being similarly adorned, but with rather 

 less fulness ; the finger slender, short, curved, not nearly half the length of the hand, 

 mth a minute dorsal cilium close to the base. 



Second Gnathopods. — Branchial vesicles large and inflated. First joint of the limb 

 reaching beyond the narrow side-plate, the upper part narrow for a short space, then 

 making a bend and widening slightly, the front margin almost unarmed, the hinder 

 with long setfe and an apical group of spines; the second with two small groups of 

 plumose setse on the hind margin and a large group at its apex; the remaining joints 

 similar to those of the first gnathopods, but the third joint is without spines on the 

 front margin, the wrist is narrower, the hand is narrower and longer, the armature of 

 both wrist and hand being slighter, though the same in general character. 



Fi7'st Perieopods. — First joint scarcely reaching beyond the side-plates, the front 

 margin straight, with three small spines near the apex, the convex hind margin cariying 

 long setse about the centre, and some spines on the lower part ; the second joint with 

 four or five setiform spines on the hind margin ; the third joint longer than the fourth 

 or fifth, fringed with spines on the hind margin, and carrying some spinules on the 

 adjoining surface, with eight short spines placed along the convex front margin, the 

 apex decurrent, fringed on the inner side with spines ; the fourth joint longer than 

 the fifth, fringed behind like the preceding joint, and also having rows of spinules on the 

 surface, the front margin carrying four groups of short spines ; the fifth joint slightly 

 curved, narrowed distally, with nine groups of short spines along the serrate hind margin 

 and five small groups on the adjoining surface, the convex front margin having spinules at 

 five or six points; the finger slender, slightly curved, nothalf the length of the fifth joint. 



Second Perieopods. — Side-plates at the widest point, just below the excavation, very 

 much wader than the two preceding plates together, the breadth and depth subequal. 

 The broad branchial vesicles not extending below the side-plates. The first joint not 

 reaching the lower margin of the side-plate, the long setse of the hind margin extending 

 to the apex ; the limb in general like that of the first perseopods. 



TJiird Perseopods. — ffind lobe of the side-plates the larger, the front one closely 

 fitting into the excavation of the preceding plate. The Ijranchial vesicles of this and the 

 next pair very large. The first joint not dilated, but a little wider above than below, 

 both margins bordered with rather short curved spines, the lower half of the hind margin 

 fringed with very plumose setse ; the four following joints all serrate and fringed -wath 

 groups of spines in front ; the third joint longer than the fourth, subequal in length to 

 the fifth, its hind margin slightly serrate, with seven single spines along it and a group 

 about the decurrent apex; the fourth joint with three groups of spines on the hind margin; 

 the fifth joint slender, slightly curved, with some spinules behind ; the finger as in the 

 preceding pair. 



Fourth Perseopods. — Side-plates rather broadly and deeply lobed behind. The first 



(ZOOL. CHALL. EXP. PART LXVII. 1887.) XxX 93 



