REPORT ON THE AMPHIPODA. 983 



longer, oblong, with three groups of spines on the hind margin and one on the rounded 

 apex ; the wrist in front scarcely longer than the third joint, with an apical spine, distally 

 cup-like, prolonged behind, and there set with many groups of spines of various lengths, 

 the apical groups the largest, many, if not all, of the spines being pectinate ; the hand 

 large, oval, the front margin smooth, with a few spines at the apex, the hind margin also 

 smooth, short, almost covered by the prolongation of the wrist, but very nearly continuous 

 with the long curve of the palm, which is set with very many slender spines and spinules 

 (smooth or almost smooth), and defined by some short palmar spines, near to which is 

 a long row beginning with stout spines near the margin, and continued for some distance 

 across the inner surface with longer and shorter stiff setae ; the long curved finger exactly 

 matches the length of the palm, it has a small dorsal cilium near the base, its inner edge 

 is smooth, except for three or four teeth or notchings near the base. 



Second Gnathopods. — The side-plates broader above than below, the front margin 

 convex, the hinder sinuous, the lower bounded by a small tooth at either end. The 

 branchial vesicles narrow, much smaller than the first joint of the limb. The marsupial 

 plates as narrow as the branchial vesicles, nearly as long as the first joint, fringed with 

 setse. The first joint reaching much below the side-plate, not so long as the hand, tin- 

 front margin concave, the armature much as in the first gnathopods, with which in other 

 respects the second closely agree, but the third joint is apically pointed, the hand is 

 very much larger, and the seven teeth of the inner margin of the finger reach more 

 nearly to the tip ; the group- of spines and setae on the inner surface near the commence- 

 ment of the palm is scarcely so large as in the other gnathopods, but there are some 

 additional groups of spines near the outer margin. 



First Pereeopods. — The side-plates like the preceding pair. The limb slender ; the 

 first joint reaching below the side-plate, carrying long setae on both margins ; the third 

 joint longer than the fifth, the fourth shorter, all three with seta? or slender spines on the 

 hind margin ; the finger narrow, a little curved, more than half the length of the fifth 

 joint. 



Second Peraeopods. — Side-plates nearly as broad as the first pair, rather deeper than 

 the third, excavate behind, the hind margin below the excavation straight, cut into four 

 teeth. The limb like that of the first peraeopods. 



Third Peraeopods. — First joint expanded, front margin convex, with spines at nine 

 points, hind margin less convex, cut into nine notches ; second joint short ; third joint 

 much longer and broader than the fourth or fifth, with spines at five points of the 

 straight front margin and three of the convex hind margin ; fourth joint slightly longer 

 than the fifth, each straight, with an apical group of spines behind, and four groups on 

 the front margin ; finger small, half the length of the fifth joint. 



Fourth Perieopods. — Side-plates shallow. Branchial vesicles narrow and short. 

 First joint of the limb longer than in the preceding pair, with spines at nine points of 



