REPORT ON THE AMPHIPODA. 951 



in the dentate distal margin ; three of the spines are on the inward slope of the 

 margin, with two short seta? on the surface near them, the remaining two on the 

 outward slope, the apical point between being rounded, hairy or minutely serrate. 



Second Maxill®. — Inner plate shorter than the outer ; eight or nine spines on the 

 slightly oblique distal margin of each. 



Maxillipeds. — Inner plates scarcely reaching beyond the base of the first joint of 

 the palp, the distal margin sloping outwards, and armed on its outer part with two or 

 three incurving spines ; the outer plates not reaching beyond the distal end of the first 

 joint of the palp, the inner margin unarmed, except for a few setae which arise on the 

 surface near it ; round the distal border there are four curved spines or setae, the hind- 

 most the longest ; first joint of the palp short, the second the longest, widening distally, 

 with some spines of various lengths, not numerous, on the inner border ; third joint 

 rather longer than the first ; finger as long as the third joint, with a sharp curved nad, 

 and some cdia near the base of it. 



First Gnathopods. — Side-plates very small, almost triangular, projecting the apex 

 forwards. The first joint reaching much below the side-plate, rather shorter than the 

 hand, the hind margin convex, the front nearly straight ; the third joint almost without 

 free front margin, with seta? or spines at two points on the hind margin, distal edge 

 somewhat squared ; the wrist much shorter than the hand, triangular, cup-shaped, very 

 slightly produced behind, with groups of serrate spines at the apex and two other points 

 of the hind margin ; the hand oval, with the broader end at the base, the hind margin 

 at intervals carrying spines of various lengths, none so powerful as the largest of those 

 on the wrist ; the front margin has a setule at the apex, and another at some distance 

 from it ; the finger is long and curved, probably antagonising with the strong spines of 

 the wrist, as there appears to be no defined palmar margin on the hand ; the nail is 

 long and sharp, with a small cilium at its base ; the dorsal cilium near the hinge of the 

 finger is very smaU. 



Second Gnathopods. — Side-plates a little larger and more squared than the pre- 

 ceding pair. Branchial vesicles scarcely so long as the first joint of the limb. The 

 Hmb in general resembling the first gnathopods ; the first joint a little longer and 

 thicker, with some setae on the hind margin near, as well as at, the apex ; the other 

 joints also slightly larger. 



First Perasopods. — Side-plates very small and shallow, the short front margin almost 

 straight, the longer lower margin convex. The branchial vesicles irregularly oval, the 

 hind margin sinuous, rather longer than the first joint of the limb. The first joint 

 extending much below the side-plate, broad except at the base, not twice* as long as broad, 

 front margin nearly straight, with one or two seta-like spines near the top, hind margin 

 convex, with spines at the apex ; second joint short ; third shorter than the fourth or 

 fifth, but broader, its hind margin straight, with two sets of spines, the front margin very 



