REPORT ON THE AMPHIPODA. 741 



long setae at various points iipon the Iiind margin, the front but slightly curved ; the 

 second joint elongate, with long plumose setae at four points of the hind margin ; the 

 third joint much shorter than the second, with a group of apical spines behind; the wrist 

 scarcely as long as the hand, and but little broader, with spines on the lower part and 

 apex of the hind margin, and on the apex of the front ; the hand with the front margin 

 almost straight, carrying spines at the apex ; the hind margin smooth for a space, then 

 serrate, with many groups of spines, many of those which are near the short strongly 

 curved finger being strongly denticulate ; the bending of the hind margin in this hand 

 makes an approach to a palm. 



First Peraeopods. — Side-plates and branchial vesicles similar to those of the preceding 

 pair, but a little longer, the side-plates also broader. The first joint scarcely reaching 

 beyond the side-plates, considerably broader than that of the second gnathopods, carrying 

 a few spinules on the front margin, and a spine on the hinder apex ; the second joint 

 with two setae on the hind margin and an apical spine ; the third longer than the fourth, 

 rather shorter than the fifth, with a spinule on the decurrent front apex and one on the 

 margin a little higher up ; the fourth joint slightly curved, each apex pointed ; the fifth 

 joint slender, curved, almost unarmed, with a tendency to pectination on tlie hind margin; 

 the finger very short, curved. 



Second Perieopods. — Side-plates very broad, very deep in front, with a small 

 interlocking process near the top of the front margin. Branchial vesicles not very broad, 

 not as long as the side-plates. Marsupial plates much narrower than the branchial 

 vesicles, and about as long. First joint of the limb not reaching the end of the side- 

 plate ; the limb in general like the preceding, but the fourth and fifth joints smaller, the 

 third being longer than either. 



Third Perwojwds. — Side-plates small, the hinder lobe the larger, the front one when 

 in situ obscured by the preceding plate. The branchial vesicles oval, not very large. 

 The marsupial plates short, with eleven setae round the apex. The first joint not 

 expanded, a little narrowed at the centre, with a few spines or spinules on the margins ; 

 the second joint, as in the preceding pairs, not so short as usual, with two or three small 

 spines on the front margin ; the third joint much longer than the fourth, a little longer 

 than the fifth, with short spines at four points of the very decurrent hind margin, and the 

 same number of spinules on the front ; the fourth joint with some microscopic spinules 

 on the straight, apically acute, front margin ; the fifth joint a little curved, the front 

 margin finely pectinate ; finger nearly half the length of the fifth joint. 



Fourth Perieojwds. — Side-plates rather deeper than broad, front margin straight, 

 hinder a little convex. Branchial vesicles widening distally. First joint expanded, rather 

 wider below than above, front margin nearly straight, furnished with a few spinules ; 

 the hind margin very slightly convex and scarcely serrate, the lower margin smoothly 

 rounded and partially overlapping the second joint ; the remainder of the limb similar to 



