REPORT ON THE AMPHIPODA. 1051 



of the hind margin ; the straight fourth joint is longer than the fifth, and has in front 

 five large spines of graduated size, besides thirteen other spines and spinules ; there are a 

 few small spines on the surface near the smooth hind margin, the apex of which has the 

 usual group ; the fifth joint has ten strong spines on the serrate front margin, one on the 

 produced apex, accompanied by a spinule and two long slender spines ; the tiny upturned 

 ringer has a dorsal eilium close to the base, and two or three dorsal denticles a little way 

 from it, the narrow part of the finger being longer than the thicker proximal part. 



Fifth Peraeopods. — Side-plates very small, narrowed behind, the lower margin carrying 

 setse on the front and spines on the after part. The first joint very similar to that in 

 Ampehsca chiltoni, but the lower margin even more drawn down behind, and the hind 

 margin forming an even more continuous curve with the lower ; the second joint with 

 two or three small spines on the front apex, the hind margin rather longer than the front 

 one ; the third joint scarcely longer than the second, the hind margin carrying five long 

 feathered setse, each apex a little clecurrent and armed with some small spines ; the 

 fourth joint longer than the preceding two united, or than the fifth, its hind margin 

 slightly concave, with an apical group of spines and a seta, the front margin convex, with 

 short surface spines dotted about near it, a spine and two setules at the quasi apex, and 

 some small spines on the serrate lower margin within the clecurrent incurved true apex ; 

 the fifth joint almost oval, with two spines at the apex behind, and seven or eight round 

 the apex in front, both margins smooth, but the surface near the hind margin marked as 

 if for the insertion of some eight spines or setas ; the lanceolate finger has six or seven 

 similar marks, its hind margin more convex than the front, and a suddenly narrowed 

 tip, less than a fourth of its total length, at the base of which two setules are inserted ; 

 the finger is a little shorter than the hand. 



Pleopods.— The peduncles have many plumose setse ; the coupling spines were not 

 examined ; on the first joint of the inner ramus of one pair, probably the third, there 

 were four cleft spines, with one plumose seta above and four below this series ; the joints 

 of the inner ramus numbered nineteen, of the outer twenty-three. 



Uropods. — The peduncles of the first pair rather longer than the rami, with spines as 

 in Ampeliscct chiltoni ; the rami with the apices curved, acute, the marginal spines not 

 numerous, the krwer ramus the longer ; the peduncles of the second pair a little longer 

 than the rami, the upper ramus very little longer than the lower, the marginal spines 

 less numerous than in the species just mentioned, the long one near the end of the lower 

 ramus strongly denticulate ; the peduncles of the third pair as in the preceding species ; 

 the rami lanceolate, the upper noticeably longer than the lower, both of them serrate on 

 both margins and furnished with spines and plumose setse. 



TJte Telson equal in length to the peduncles of the third uropods, not twice as long as 

 broad, the sides nearly parallel for the first half, then gently curving to the broad apices, 

 which are sharp at the inner corner, at the outer carrying a spine with accessory thread 



