REPORT ON THE AMPHIPODA. 987 



pectinate, with two hairs near the middle on one side conspicuous ; the long front margin 

 is not very convex, and like the short hind margin not armed unless by a few adjacent 

 setas ; the long finger curves closely over the whole palm margin ; dorsal cilium close to 

 the base, very small. 



Second Gnathopods. — Side-plates much narrower below than above, the front margin 

 very convex, the lower scarcely distinguishable from it ; the hind margin forming a little 

 tooth where it joins the lower. The branchial vesicles as long as the first joint and 

 rather broader. The marsupial plates longer, much narrower, fringed with setaa. The 

 limb like that of the first gnathopods, but the first joint longer, with the front margin 

 slightly concave, the second joint broader, the third with a more elongate apex, the 

 wrist broader, the hand and finger considerably larger ; the finger has seven teeth or 

 notchings of the inner margin beginning from the hinge, the dorsal cilium is very small ; 

 submarginal to the outer rim is a row of setules over the notched part of the inner 

 margin. 



First Perssopods. — Side-plates like the preceding pair. Branchial vesicles nearly as 

 long as the first joint and more than twice as broad. Marsupial plates as long as the first 

 joint, but narrower ; the first joint reaching much beyond the side-plate ; fringed with 

 setas ; the third joint longer than the fourth, shorter than the fifth but much broader, 

 the hind margin nearly straight, carrying a few spinules ; the fourth joint with slight 

 spines at six points of the hind margin ; the fifth joint with a row of eleven spines along 

 the hind margin, and a long one at the apex of the front ; the finger not half the 

 length of the fifth joint, not much curved. 



Second Perieopods. — Side-plates broad, though not quite so broad as the lower part 

 of the first side-plates, the excavation behind narrow, the margin below it parallel with 

 the front, having a small notch at the centre and one where it meets the lower margin. 

 Branchial vesicles longer than the first joint, broader than the preceding pair. Marsupial 

 plates and the limb as in the preceding pair. 



Third Perseopods. — First joint expanded, the front margin convex, with spines at 

 nine points, the hind margin nearly straight, with eleven notches of different depths, the 

 lower margin almost straight ; the second joint with the convex hind margin apically 

 acute ; the third joint longer than the fourth or fifth, with spines at five points in front 

 and at four behind ; the fourth joint shorter than the fifth, with spines at four points in 

 front and two behind ; the fifth with spines at eight points on one margin, and setae and 

 perhaps spines at eleven points on the other; the finger slender, not one-third the length 

 of the fifth joint. 



Fourth Perseopods. — Broken below the third joint ; the first three joints very like 

 those of the third pair, but larger. 



Fifth Perseopods.— Like the third pair, but very much larger, the first joint at the 

 top broader than in the fourth pair, as that is broader than in the third pair ; the hind 



