REPORT ON THE AMPHIPODA. 1117 



upper and lower prominences, strongly on the lower ; the inner lobes narrowed below, 

 strongly furred above ; the mandibular processes divergent, apically rounded. 



First Maxilla}. — The inner plate having the inner margin fringed with many slender 

 plumose setae ; the outer plate with ten spines on the distal margin, of which two have 

 a single tooth on the outer side, one a single tooth on the inner side, the rest having from 

 two to five denticles apiece, except one of the outermost, which is apparently without 

 teeth ; the second joint of the palp of nearly equal breadth throughout, curved, with nine 

 spine-teeth round the curve of the apical margin, most of these being pectinate on the 

 outer margin ; there are on one maxilla six, on the other seven, setiform spines passing 

 across the surface from the inner margin towards the outer apex. 



• Second Maxillse. — The inner plate a little shorter and much narrower than the outer, 

 with a long row of three and twenty plumose setse passing from near the base in a gentle 

 curve towards the outer apex ; there are also spines along the slightly serrate nearly 

 straight inner margin and many on the narrow apex ; on the outer plate a row of six- 

 teen or seventeen long spines singly or in pairs, beginning on the upper half of the 

 straight inner margin, passes towards the apex, keeping near the margin ; about as many 

 more encircle the broadly rounded apex and its outer slope ; this plate is narrower at 

 the base than above, the reverse being the case with the inner plate, 



Maxillipeds. — The inner plates reaching just beyond the first joint of the palp, with 

 many plumose setae along the inner margin, and several feathered spines along the distal 

 margin and a spine-tooth at the inner apex ; the outer plates rather narrow, not quite 

 reaching the apex of the second joint of the palp, with sixteen serrate spine-teeth 

 (graduated in size) on the inner margin, three on the apical, followed by nine long seti- 

 form spines which reach a long way down the hind margin, all the spine-bearing margins 

 being serrate ; the first joint of the palp short ; the second long, well fringed on the 

 inner margin with long spines ; the third joint a little longer than the first, widening 

 distally, both margins and the apex being set about with spines, two at the apex being 

 strongly pectinate ; the finger, including the ungual spine, is nearly as long as the third 

 joint, its inner margin nearly straight, with two rows of pectination ; the spine which 

 does duty for a nail is also pectinate, shorter than the trunk of the finger, and is accom- 

 panied by another spine and a spinule near the base on the inner margin of the finger. 



First Gnathopods. — The side-plates much wider below than above, the lower front 

 corner being strongly produced towards the base of the lower antenna? ; there are several 

 setae on the lower margin, chiefly on the hinder part ; the integument is marked with 

 little dots, which are bright when seen by transmitted light ; these, however, are not 

 confined to the side-plates. The first joint reaching beyond the side-plate, carrying 

 a few setiform spines at different points of both margins ; the second joint short, 

 with some slender spines at the apex behind ; the third joint broader above than 

 below, the hind margin straight, carrying several spines, especially on the serrate part 



