REPORT ON THE AMPHIPODA. 1187 



has long spines round the broad serrate distal margin, which is oblique on the outer 

 side. 



Maxillipeds. — The inner plates small, not reaching the distal end of the palp's first 

 joint, with a row of seven plumose setse beginning high up on the inner margin and 

 passing on to the surface near the apex ; the distal margin is broad, with three short 

 spine-teeth and several slender feathered spines ; there is another spine-tooth submarginal 

 to the inner apex ; the outer plates scarcely reaching beyond the middle of the palp's 

 second joint, with seven spine-teeth spaced along the serrate inner margin, and six spines 

 round the serrate distal margin, of which two might count as long teeth, the others being 

 setiform ; the first joint of the palp short ; the second considerably more than twice as 

 long, with many groups of long spines along the inner margin, and at the apex on both 

 margins ; the third joint about as long as the first, oval, with oblique rows of spines on 

 the surface and many spines about the apex ; the finger, if the spine-like nail be included, 

 is even longer than the third joint ; its basal part is scarcely so long as the serrate nail, 

 near the root of which, on the inner margin, it has several spines of various sizes, one 

 very similar to the nail, and not much shorter or narrower. 



First Gnathopods. — The side-plates of a breadth much less than the length of the 

 segment, the depth less than the breadth, the front margin forming a sharp angle with 

 the lower, the hind margin having a small pointed apex. The first joint almost free 

 from the side-plate, its front margin nearly straight, and unarmed, with an inner margin 

 that has a row of spines round the apical curve ; the convex hinder margin has a spinule 

 here and there and near the apex some long setiform spines ; the second joint short, with 

 spinules on the front lobe, and a brush of very long setiform spines near the apex behind ; 

 the third joint not very long, with convex margins converging to a pointed apex, and 

 many groups of long spines on or near each ; the wrist widest where it becomes free from 

 the third joint, subequal in length to the hand, most of the free hind margin fringed 

 with long spines, of which there is a group numbering six or seven across the inner 

 surface, and others near the distal margin ; the hand attaining its greatest breadth close 

 to the base, then narrowing to the apex, with five or six long rows of spines encircling 

 the convex front margin ; the hind margin, all but a small piece at the base, tending to 

 concave and forming the palm, fringed with long spines, of which also the inner surface 

 carries several groups ; the finger long and broad, reaching nearly to the end of the 

 palm, the inner margin divided into many slender teeth. In the female the spines are 

 much fewer and shorter, the wrist and hand are stouter compared with their length, the 

 hind margin or palm of the hand is convex. 



Second Gnathopods much larger than the first, and the segment is dilated to suit this 

 great increase. The side-plates larger than the preceding pair, their breadth not equalling 

 the length of the segment, the lower margin presenting a bilobed or trilobed appearance. 

 The first joint almost entirely free from the side-plate, narrow at the neck, widening 



