REPORT ON THE AMPHIPODA. G23 



outer plates reaching as far as the second joint of the palp or a little beyond, with ten strong 

 teeth on the inner margin set close together, an eleventh on the apical margin separated 

 by a short interval from the rest, and beyond this two spiniform teeth ; second joint of 

 the palp not longer than the first, the third joint shorter ; the finger short, with a rather 

 long nail accompanied by three cilia, the usual dorsal cilium rather nearer the origin of the 

 finser than that of the nail. 



First Grnathopods. — Side-plates broader above than below, very convex behind, with 

 a slight concavity in front. First joint extending much beyond the side-plate, fringed 

 with long setse in front ; third joint with no free front margin, some groups of setae on 

 the hind margin ; wrist subtriangular, much shorter than the hand, and scarcely broader 

 distally than the base of the hand, very setose on the free hinder margin and the 

 contiguous portion of the inner side ; hand oblong, longer than the three preceding joints 

 combined, a little broader at the base than at the palm, front margin continuous with that 

 of the wrist, having few setae except at the apex, while the hinder margin and contiguous 

 inner side are densely setose with plumose setae ; palm a little concave, bounded by two 

 stout spines with fine curved tips ; along the palm are close-set straight cilia, and a row 

 of longer cilia not close set ; the finger just the length of the apical margin of the hand, 

 with one tooth on its inner edge, and a dorsal cilium near the base. 



Second Gnathopods. — Side-plates of very even width throughout. Branchial vesicles 

 large and broad except at the neck. First joint a very little wider below than above, 

 scarcely curved, the setae on the front margin fewer and much shorter than in the pre- 

 ceding pair ; the second joint nearly as long as the wrist ; third much shorter, a little 

 furred behind, with spines on the rounded apex ; the wrist furred on the hinder margin, 

 with little fan-shaped scales on the breast, and long pectinate spines near the apex ; 

 the hand furred but not densely, somewhat narrowed proximally and distally, the hinder 

 margin a little outdrawn, the overarching spines of the front and apical margins and 

 those of the hinder margin having their pectinatious confronting in each set those of 

 the other set ; the palm sloping inwards, microscopically pectinate, the minute finger 

 neatly fitting it with its inner edge also for the distal half microscopically pectinate, 

 and carrying a dorsal cilium on the thick portion near the hinge. The tip of the finger 

 closes down against spines at the outer end of the palm ; it is probable that this is the 

 case in all species of this family, but in regard to many the fact is not mentioned from 

 the difficulty of observing such spines with certainty in the midst of the dense fur some- 

 times present. 



First Perseopods. — Side-plates long, slightly widening downwards. Branchial vesicles 

 broad, seemingly without folds. Marsupial plates, in this specimen, narrow, with few 

 setae. First joint reaching about as far as the side-plate ; third joint much longer than 

 fourth or fifth ; fourth scarcely so long as fifth ; the tliird and fourth bordered behind 

 with groups of setae of various lengths ; in the fifth the groups consist of a spine with a 



