REPORT ON THE AMPHIPODA. 705 



liaiicl, the hind margin densely furred for most of its length, the setae few, some long 

 ones at the apex ; the hand long and narrow, furred densely along the hind margin ; 

 with several spine-like setaj on the lower part ; on the lower part of the front margin 

 some very long spines, besides smaller ones, over-arching the small much-curved finger, 

 which nearly covers the narrow apical or palm margin of the hand. 



First Perxopods. — Side-plates oblong, nairow, reaching over the lower front angle 

 of the head, the lower border serrate at each end and slightly crenate in the middle. 

 The marsupial plates longer than the first joint of the limb, distally bent. The 

 first joint long and narrow, reaching beyond the side-plate ; the third joint not so 

 long as the fourth or fifth, with five groups of setae on the hinder, and two or 

 three on the front margin ; the fourth and fifth joints equal in length, both carrying- 

 setae and spines, the fifth having a row of eight spines on the hind margin ; the finger 

 short, worn at the tip. 



Second Perseoiwds. — Side-plates very broad, except at the excavation, which does 

 not extend far down, the front margin straight, and so also the hind margin below 

 the excavation, the front and hind margins slightly diverging downwards ; the first 

 joint not reaching beyond the side-plate, the third, fourth, and fifth joints subequal ; 

 the limb in general like that of the preceding segment. 



Third Perieopods. — The side-plates much wider than the first joint of the limb, the 

 back lobe produced considerably below the front one. The first joint scarcely longer 

 than broad, front margin a little convex, with spines at six points, the hind margin 

 irregular, not much serrate, producing the greatest width two-thii'ds of the way down, 

 then with an oblique curve reaching but not overlapping the second joint ; the thiixl 

 joint somewhat decurrent, longer and much broader than the following joint, with spines 

 at five points in front and three behind ; the fourth joint shorter than the fifth and 

 scarcely broader, with spines at four points in front ; the fifth joint somewhat longer 

 than the third, with spines at seven points in front ; finger not a third of the length of 

 the preceding joint, with a rounded end as if worn by use. 



Fourth Perseopods. — Side-plates broader below than above, with the angles behind 

 rounded, but squarish in general appearance. Branchial vesicles of the general form of 

 an oval, bent very much forwards and in front, at the neck having an accessory vesicle 

 attached, of something the same shape, on a very much smaller scale. The first joint 

 is oblong, with a rounded lower margin just overlapping the short second joint, the 

 front margin spined, the hind margin irregularly serrate ; the lower joints of the limb 

 missing. 



Fifth Perieopods. — The side-plates with the hind margin more convex than in the 

 preceding segment. Branchial vesicles small, looking like a wide flask, narrow- 

 mouthed, attached by its handle. The first joint similar to that of the 2>receding 

 pair, but larger, and with the lower margin squared and roughly serrate, the third joint 



(zooL. CHALL. EXP. — PART Lxvii. — 1887.) Xxx 89 



