REPORT ON THE AMPHIPODA. 1239 



the apical margin, and at the actual apex a short stout spine pectinate on two edges 

 and with a slender curved tip. 



First Maxillae. — Inner plate absent or rudimentary; outer plate not broad, apically 

 carrying five or (perhaps) six small spines ; the first joint of the palp more than half 

 the length of the second, the second having a few spinules or setules on the more or 

 less denticulate apical margin. 



Second Maxillae. — The inner plate very small, with two small setse or slender 

 spines on the rounded apex ; the outer plate apically rather narrower than the inner, 

 with three or four spines or setae, the outer margin bowed out below. 



Maxillipeds. — The inner plates very small, not reaching even to the base of the 

 palp, having a setule on the inner margin and two on the rounded apex ; the outer 

 plates narrow, reaching about to the centre of the second joint of the palp, with four 

 spinules along the inner and apical margin ; first joint of the palp the shortest, the 

 second not twice as long, with a small spine on the inner margin near its apex, the 

 third joint about equal in length to the second, with three spinules near the inner 

 apex and a setule near the outer, the ringer as long as either of the preceding joints, 

 with a cilium near the acute curved tip. 



First Gnathopods attached close to the maxillipeds. The first joint little longer 

 than the hand, a little widened distally ; the second joint rather longer than broad, the 

 third joint longer than the second, as long as the wrist, narrow at the neck, the hind 

 margin longer than the front, nearly straight, the broad apex having two setules, the 

 surface one ; the wrist small, four-sided, carrying a couple of setules, the front margin 

 the longest, convex ; the hand much larger than the wrist and abruptly wider, between 

 oval and triangular in shape, narrowing to the distal end, the front margin convex, 

 with some apical setules, and a row of setiform spines on the surface near its distal 

 half ; the short hind margin almost at right angles to the front margin, while its place is 

 practically taken by the long, nearly straight, palmar margin, which has a row of four 

 spinules and another of four setules adjacent to it, the edge itself being microscopically 

 ciliated or pectinate ; the long, curved, acute finger matches the palm, its tip closing 

 down between two small palmar spines, its inner edge strongly pectinate. 



Second Gnathopods attached close to the proximal end of the segment. The first 

 joint similar in shape to that in the preceding pair ; the second joint longer than broad, 

 longer than the third joint ; the third joint very short, front and hind margins almost 

 equal, narrow at the neck, the distal margin flat ; the wrist very small, triangular, 

 shorter than the third joint, with only the front margin free ; the hand similar in 

 structure to that of the first gnathopods, but less narrowed apically, the palm margin 

 entirely taking the place of the hind margin, from which it is marked off by a small 

 projection with a strong palmar spine planted on it ; the palm margin, besides having 

 some spinules and setules at intervals along it, is finely but irregularly denticulate, 



