REPORT ON THE AMPHIPODA. 1263 



much longer than the second, with slender spines at two or three points of the straight 

 hind margin, and several long ones on the inner surface near both the front margin and 

 widened apex ; the wrist rather broader than long, the rounded process behind not 

 produced at all downwards, fringed with spines ; the hand much longer than the wrist, 

 narrowing distally, the lower border straight, the whole hind margin occupied by the 

 palm which is finely cut into little bifid and trifid denticles, bordered with setules and 

 defined by a couple of palmar spines ; there are several setiform spines about the surface 

 of the hand ; the broad curved apically acute finger reaches over the full extent of the 

 palm, the nail passing the palmar spines ; the inner margin has a tooth just before 

 reaching the nail, its whole extent being finely though irregularly denticulate, and, the 

 inner part of the finger being channelled, there is a second more strongly denticulate 

 margin. 



Second Gnathopods attached near the front of the segment. First joint not so long 

 as the hand, widened a little distally, and with the front apex a little produced ; second 

 joint not longer than broad, with a group of spinules above the hinder apex ; third joint 

 small, a little longer than broad, with a few small spines about the hind margin ; the 

 wrist broader than long, but of quite insignificant dimensions, forming rather a narrow 

 base to the hand than acting as an independent joint ; the hand large, twice as long as 

 broad, the long convex front margin carrying a few small distant spines, the setiform 

 spines of the surface not numerous, the hind margin short, oblique ; the palm long, 

 convex, fringed with many small spines and spinules, the margin very faintly crenulate, 

 having a small acutely angled prominence not far from the hinge of the finger, while at 

 the other extremity there is a bold tooth followed by a rather deep cavity with palmar 

 spines above and below, between which the acute tip of the long broad slightly curved 

 finger closes down ; the inner edge of the finger is sharp and almost smooth ; there are 

 small setules on the surface within the inner margin, and there is a small dorsal cilium 

 at some distance from the hinge. 



First Perseopods. — Eudimentary side-plates very indistinct, behind the centre of the 

 segment. Branchial vesicles elongate oval, the hinge joint very small. Marsupial plates 

 large, with some short setae about the front and long ones about the hinder margin. 



Second Perseopods. — The diminutive side-plates at the centre of the segment. The 

 branchial vesicles like the preceding pair. The marsupial plates without setse. 



Third Perseopods. — The small plate or joint within which (as seen from the ventral 

 side) the first joint of the limb is socketed, is produced downwards and outwards to an 

 acute apex. The first joint widening distally from a narrow neck, scarcely longer than 

 broad, with some spines at each apex, the outer apex prominent, a little blunted ; the 

 second joint short and narrow, with spines at the inner apex ; the third joint nearly as 

 long as the first and nearly as broad as long, with some slender spines about the distal 

 margins ; the fourth joint as long as the third, but narrower, the spines on the inner 



