REPORT ON THE AMPHIPODA. 745 



front; the short second joint with one apical spine behind, the rhomboidal third joint 

 with three, and one at the centre of the hind margin ; the wrist short, broad, distally 

 cup-like, with nine or ten spines on the inner side of the hind apex, which is produced 

 along the hind margin of the hand, the tips of the spines reaching the palm ; the hand 

 large, widest at the palm, the front margin convex, with a submarginal cilium near the 

 centre, a subapical seta and cilium, and rounded apex, the hind margin sinuous, smooth 

 or microscopically downy ; the palm broad, convex, finely pectinate, at right angles with 

 the hind margin, having two palmar spines at the commencement, followed by a row of 

 nine submarginal spinules, and two setules close to the hinge ; there are a very few slender 

 spines on the surface ; the finger is long, a little curved, tapering to an extremely fine 

 point, reaching beyond the palm, the inner margin of the broader half near the base set 

 with about fifteen little spiny teeth. 



Second Gnaihopods. — Side-plates longer and broader than the first, rather wider 

 below than above, lower margin rounded and slightly crenate as in the two following 

 pairs. The branchial vesicles in this and the following segments small, oval. The 

 marsupial plates very small, and, so far as observed, without setse. First joint of the 

 limb longer than the hand, slightly curved, with a few setules along the concave front 

 margin, the hind margin with an apical sj)ine, the first half of which is broad, the distal 

 half narrow, the corresponding spine on the first gnathopods having probably the same 

 character; the second and third joints resemble those of the preceding pair, except that 

 the third joint has three short but stout spines along its hind margin, the largest near 

 the apex, which has one slender spine ; the wrist is distally cup-like, short except for the 

 very long hinder process, the apex of which nearly reaches the palm of the hand and is 

 tipped with three or four spines ; the hand resembles that of the preceding pair, but 

 like the rest of the limb is very much larger, the suljmargiual spinules eighteen in 

 number, the front margin having a little cilium-bearing apical point which is not pro- 

 duced ; the finger has twenty teeth, some of which are submarginal but the majority 

 marginal as in the preceding pair ; the series ends with a much larger tooth or spine ; 

 there is a minute dorsal cilium very far from the base of the finger. 



First Perwopods. — Side-plates larger than the preceding pair, but similar. The 

 first joint reaching below the side-plate, carrying some setules on the front margin, and 

 an apical spine on the hinder ; the second joint with two setules on the hind margin ; 

 the third joint slightly curved, with small spines at four points on each margin, the 

 front margin apicaUy decurrent. The rest of the limb missing, a defect shared by all the 

 perseopods. 



Second Perwopods. — Side-plates much broader than the preceding pair, the excavation 

 behind not descending far, the broadest part of the plate just below it. The limb like 

 that of the preceding pair, but the first joint not reaching beyond the side-plate. 



Third Perasopods. — The hind lobe of the side-plate deeper than the front. The 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 94 



M 



