REPORT ON THE AMPHIPODA. 801 



down the inner margin ; the first joint of the palp is short, the second very long, fringed 

 on the inner margin with long plumose setae, which, like those of the outer plate, might 

 equally well be designated as spines ; the third joint a little bent, with two plumose 

 setae on the convex outer margin, and three on the truncate distal border ; the finger 

 very small, the long spine-like nail being about twice as long as the base. 



The triturating organs appear to have very many slender spines, but not stout strong 

 ones. 



First Gnathojwds. — Outline of side-plates not clearly made out. First joint reaching 

 much beyond the side-plate, as long as the wrist, widening distally, near the front apex 

 having two long plumose setae ; the second joint with a plumose seta on the hinder apex ; 

 the third joint with the hind margin almost semicircular, carrying a setule at the centre, 

 two plumose setae near the apex ; the wrist a very elongate oval, narrow at both ends, 

 much longer than the hand, the front margin convex, unarmed, except that at the apex 

 there are two geniculate spines which have their lower half pectinate ; the hind margin 

 more convex, fringed with eighteen long plumose setae, near which there are five or six 

 smaller setae on the surface ; the hand narrow at the base, thence rapidly widening, 

 tending to oval, the front margin with two apical spines, one apparently smooth, the 

 other feathered with six or seven long branches; the convex hind margin carries nineteen 

 long plumose spines or setae, and close to the finger a geniculate spine much longer than 

 the rest, and much longer than the finger ; the surface has many adpressed cilia near 

 the front, and five plumose spines near the hind margin ; the finger is nearly as long 

 as the hand, slender, slightly geniculate, the tip curved. 



Second Gnatho^iods. — Side-plates doubtful, seemingly with the front and lower margin 

 forming a continuous convex curve. Branchial vesicles longer than the first joint of the 

 limb. In a female specimen the marsupial plates were very narrow, but nearly as long 

 as the branchial vesicles, and having long setae. The first joint of the limb slenderer than 

 in the preceding pair, about as long as the wrist, but narrower ; the second and third 

 joints small as in the preceding pair, the third with two setules but seemingly without 

 long apical setae ; the wrist elongate, as long as in the preceding pair, but much narrower, 

 narrowest distally, the hind margin carrying about fourteen- pairs of long setae, strongly 

 rather than densely plumose, most of them geniculate, and on a blunt apex having a 

 little point with two long arms, diverging one on either side ; the hand longer and narrower 

 than in the preceding pair, about three-quarters the length of the wrist, narrow at both 

 ends, with seven of the furcate and six of the unfurcate setae along the hinder margin, 

 the apex having two of much greater length than the rest, longer than the hand itself ; 

 between the two latter is the minute finger, of which the basal portion has a tooth on the 

 inner margin, and the nail, which is equally long but abruptly narrower, has one on the 

 outer. 



First Peraeopods. — Side-plates larger than the preceding pair, front margin similar, 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 101 



