EEPOET ON THE AMPHIPODA. 765 



spine-row of six short denticulate spines, tlie first tliree pointing forwards ; the palp very 

 small, the first joint very short, the third joint probably occupying the short space 

 between the apical seta and the seta on the inner margin below it, but I could not 

 perceive any dividing line to mark ofi" this from the second joint. 



Lower Lip. — Mandibular processes short, apically narrow, divergent. 



First Maxilla}. — The inner plate rather flat-topped, with one seta at the inner end of 

 this margin ; the outer plate as usual strongly ciliated on the inner margin, and with six 

 spines in the usual arrangement and projiortions on the distal margin, the innermost 

 being finely pectinate, while the second and third are denticulate for a short space ; the 

 palp is two-jointed, as in the other species here described. 



Second Maxillse. — The inner plate shorter than the outer, with very fine setae or spines 

 on the apical margin. 



Maxillipcds. — Inner plates reaching halfway along the inner margin of the second 

 joint, the distal margin sloping a little outwards, with a small spine-tooth just within the 

 inner apex, and a spinule near the outer corner ; the second joint much longer than the 

 first, with fine spinules along the inner margin, not spaced alike on the two members 

 of the pair in the specimen examined, the rudimentary plate rather narrow ; the first two 

 joints of the j^alp short and broad, not longer than their breadth, the third joint a little 

 longer, with adpressed cilia on the back, the outer margin very convex ; the finger of the 

 usual structure, but the narrow terminal part not elongated. 



First Gnathopods. — Side-plates very small, completely covered by the following pair. 

 First joint rather longer than wrist and hand united, narrowed at the base and distally, 

 the front margin carrying a few setules, the hind margin of this and the following joint 

 carrying an apical seta and setule ; the third joint short, but as long as the wrist, the 

 lower part behind strongly furred, the truncate apex armed with two spinules and two 

 spines, one of which is distally serrate ; the wrist triangular, distally cup-like, as broad as 

 long, with a few spines on the hinder apex ; the hand much longer than the wrist, tending 

 to oblong, the longer and more convex front margin carrjdng three long spines at 

 intervals, and on the apex a group of small setfe, the almost straight hind margin having 

 one seta ; the palm convex, not very oblique, very minutely pectinate, defined by a 

 minute tooth at the apex of the hind margin, within which are two stout palmar sjjines 

 and a long seta, followed by a few submarginal setules ; the finger, with a dorsal cilium 

 near the base, fits closely over the palm, the tip closing down between the two palmar 

 spines. 



Second Gnathopods. — Side-plates nearly semicircular, but rather more than twice as 

 long as broad. Branchial vesicles very small, not half the length of the first joint, twice 

 as long as broad. The marsupial plates considerably longer than the first joint, more 

 than three times as long as broad, fringed with setse. The first joint as long as the wrist 

 and hand united, scarcely reaching the end of the side-plate, the margins fringed with 



