REPORT ON THE AMPHIPODA. 707 



Upper Antennw. — First joint scarcely longer tbiiu the two following united ; 

 flagellum of five joints, together not longer than the peduncle ; secondary flagellum of 

 two joints, not so long as the first two of the primary. 



Lower Antennse. — Gland-cone prominent, third joint very short, fourth longer and 

 thicker than fifth ; flagellum tapering, of five joints, the first as long as the fifth joint of 

 the peduncle. 



Mandibles. — Cutting edge smooth, with a small tooth at the upper corner ; secondary 

 plate of the left mandible with the broad apical margin cut into four or five denticles 

 facing towards the cutting edge ; the spine-row of six or seven small spines ; the 

 molar tubercle not prominent, directed backwards, a little ciliated ; the palp set rather 

 far back, just over the molar tubercle, the third joint not much shorter than the second, 

 with conspicuous adpressed cilia, and at the apex three setae. The shaft of the mandil^le 

 is rather less slender than it appears in the position represented in the figures m.m. 



First Maxillfe. — Inner plate oval, only one plumose seta observed on the apex ; outer 

 plate seemingly with nine denticulate spines, no palp. 



Second Maxillie. — Inner plate with seven or eight apical spines or setse ; outer plate 

 rather longer than the inner, similarly furnished. 



Maxillipeds. — Inner plates very long, the apical margin with two little cavities 

 between the three teeth, below which are some spines on the outer margin ; outer plates 

 broad and long, one long seta far down on the inner margin, the rest of which is smooth, 

 the apical margin scarcely crenate ; the third joint of the palp nearly equal in length to 

 the second ; the fourth minute, without a nail, tipped with two setse. 



First Gnathop)ods. — The first joint longer than the next three together, the second 

 longer than the third, and as long as the fourth, all these four carrying apical spines 

 behind ; the hand longer than the wrist, tapering distally, with a few setse on or near the 

 hind margin and apically in front ; the hind margin strongly pectinate, with no palm 

 margin ; the finger short, a little curved, with a dorsal cilium near the hinge, and one or 

 two Ipng along the inner edge by the nail. 



Second Gnathopods. — First joint projecting beyond the side-plate, not as long as the 

 wrist and hand together ; second joint longer than the third, the wrist longer than the 

 hand, parallel-sided for most of its length, tufted with fur on the hind margin, where also 

 apically it has some long setse ; hand long, almost parallel-sided, furred behind, with 

 long spines at and near the apex on each margin ; palm convex, bordered with minute 

 cilia and defined by two short spines ; the finger thick at the base, curving over the 

 palm, with a dorsal cilium and some cilia on the inner edge near the nail. 



First Perieopods. — Side-plates oblong, the front margin straight, the hinder a little 

 sinuous and the lower convex ; the first joint not reaching the end of the side-plate, the 

 third rather longer than the fourth and shorter than the fifth ; the nail curved, more 

 than half the length of the fifth joint. 



