REPORT ON THE AMPHIPODA, 769 



part of the hand seeming to have armature in all the species ; the outer margin of the 

 finger forms a very regular curve, and has a long dorsal cilium near the base, the inner 

 margin is less convex, pectinate, and carries six cilia or setules, the two longest at the base 

 of the nail. 



Second Gnathopods. — Side-plates very broad, especially below, the front margin 

 forming a continuous curve with the broad lower margin. The branchial vesicles not so 

 small as in some of the species, pear-shaped, broader than the first joint but not so long. 

 Marsupial plates almost circular, as broad as the side-plates, the distal half fringed with 

 setse. The first joint of the limb just reaching below the side-plate, ■ fringed as in the 

 first gnathopods ; the second joint having a spine on the hind margin above the apical 

 group ; the third joint having the front margin short, with a blunt apex, the hind margin 

 longer, with spines at two points, and a group across the almost acute apex ; the wrist 

 shorter than the hand, broader than long, not as in the first pair longer than broad, 

 distally cup-like, furred behind, and having at the apex eight pectinate spines ; the hand 

 strong, broadest at the palm, there exceeding the breadth of the wrist ; the hind margin 

 produced into a small tooth which defines the broad, finely denticulate palm ; within the 

 process of the hind margin is a group of seven palmar spines, the palm being also fringed 

 with setae and setules, some of the former being moreover studded about the surface of 

 the hand ; the finger as in the first gnathopods, except that the inner margin is not 

 pectinate. 



First Peraiopods. — Side-jjlates large, oblong, with the front and lower margins a little 

 convex, and the upper a little oblique. Branchial vesicles like those of the preceding 

 segment, but larger. Marsupial plates similar to the preceding pair. First joint of the 

 limb just reaching below the side-plate, the front margin carrying setae, the hinder a few 

 setules ; the third joint longer than the fourth or fifth, with four setules on the straight 

 hind margin, a spine near the top and another on the slightly deeurrent apex of the front 

 margin; the fourth joint with a couple of spinules on the hind margin, and a long spine 

 at its apex ; the fifth joint longer than the fourth, nearly as long as the third, narrowing 

 distally, with spinules at three or four points of the straight hind margin ; the finger 

 short, much curved, about half the length of the fifth joint. The perseopods in this 

 species are of stouter build than in the others that have been described. 



Second Perwo^oods. — Side-plates large, broader than deep, of almost uniform depth for 

 the first half, broadly rounded behind. The limb similar to that of the preceding pair. 



Third Per^opods. — The side-plates rather deeply lobed behind. The branchial 

 vesicles and marsupial plates deeper and broader than the lobe of the side-plate. The 

 first joint of the limb not winged, distally a little widened, fringed on both margins with 

 spinules, behind with a small distal lobe partially overlapping the short second joint; the 

 third joint longer than the fourth or fifth, with spines at three points of the convex hind 

 margin, and a group on the deeurrent apex ; the fourth joint short, -wdth an apical group 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 97 



