REPORT ON THE AMPHIPODA. 1149 



Second Gfnatkopods rather smaller than the first. The side-plates not very unlike the 

 preceding pair, but deeper than broad, not so strongly directed forward ; the lower margin 

 similar. The branchial vesicles oval, broader below than above, as long as the first joint 

 and wider. The marsupial plates rather wide and long. The first joint almost free from 

 the side-plate, narrower than in the first gnathopods, with long setiform spines spaced 

 along the two margins, which are nearly parallel ; the second and third joints as in the 

 preceding pair ; the wrist as long as the hand and distally wider, with five or six groups 

 of slender spines along the long front margin, and the free part of the hind margin very 

 thickly set with the same ; the hand narrower than in the first gnathopods, fully twice as 

 long as broad, of nearly even width throughout, but with the front margin slightly 

 convex, the hinder straight ; numerous groups of spines are on and near each margin ; 

 the finger appears to be similar to that of the first pair, but is much shorter, and never- 

 theless its curved tip reaches just beyond the short convex palm. 



First Perteopods. — The side-plates as broad as deep, directed forwards, the front 

 margin very convex, the lower straight, a little notched for the setae. The branchial 

 vesicles as in the preceding segment. The marsupial plates longer and much broader 

 than the first joint, narrowed only at the distal end, the fringing setae not long in pro- 

 portion to the breadth of the plate. The first joint almost free from the side-plate, 

 packed with gland-cells, with slender spines along the somewhat convex margins ; the 

 second joint with a small spine on the lobe in front, and a group of spines at the apex 

 behind ; the third joint broad, longer than the fourth or fifth, with a slender spine at 

 each of two points on the front margin, and a group at its rounded apex, the hind margin 

 with two groups ; the fourth joint much narrower than the third, but broad in propor- 

 tion to its length, with spines at the apex of the front margin, and in several groups along 

 the hind margin, which is also furred with long cilia ; the fifth joint longer than the 

 fourth, the front margin convex, with a group of spines or setae below the middle and 

 another at the apex ; the hind margin almost straight, furred, and carrying about eight 

 groups of spines or setae, which like the rest on this limb are feathered, but more 

 prominently so ; the finger curved, more than half the length of the fifth joint, having a 

 feathered cilium near the hinge, and an opening in the apex. 



Second Per&opods scarcely differing from the first ; the side-plates, branchial vesicles, 

 and marsupial plates a little wider. 



Third Perseopods. — The side-plates much broader than deep, the front lobe narrowed 

 below and fringed with setae, having also many on the inner surface, the hind lobe broad 

 and shallow, with the lower margin nearly straight, the hinder rounded and carrying one 

 or two spines. The branchial vesicles shorter than the preceding pair, very broad at the 

 centre. The marsupial plates narrower than the preceding pair. The first joint of the 

 limb scarcely expanded, but wider than the following joints, twice as long as broad, with 

 spines along both margins, some in the front elongate ; the second joint a little longer 



