REPORT ON THE AMPHIPODA. 689 



stout at its base, aud ends in a narrow hooked nail ; the dorsal cilium is fixed at about the 

 centre. 



First Peraeopods. — Side-plates long, expanding gradually from above ; first and 

 second joints together not reaching to the end of the side-plates ; third joint broader 

 but not so long as the fourth ; fourth not so long as the fifth, some fine setae on the 

 hinder margin of the second, third and fourth joints, on the fifth three or four cilia 

 at intervals on each margin, and on the hinder two small inward-curving spines 

 close to the finger-joint; the finger long and slender, with a dorsal cilium close to the 

 hinge. 



Second Perseopods. — Side-plates with a rather deep but not wide excavation. 

 Fourth and fifth joints rather shorter than in the preceding pair. 



Third Peraiopods. — Side-plates with breadth and depth subequal. First joint a 

 little longer than broad, of nearly even diameter throughout, with spines on the front 

 margin, the hinder serrate ; the third joint expanded, produced behind, longer and 

 much broader than the fourth ; the fourth shorter than the fifth, which is straight, 

 narrow, somewhat tapering ; one or two spines on each of the three last-mentioned 

 joints ; the finger long, thin, and straight, but the whole of the limb beyond the first 

 joint insignificant in size compared with that joint, and that joint itself considerably 

 smaller than the side-j^late. 



Fourth Peraiopods. — The side-plates with front and hind margins parallel, lower 

 margin outdrawn behind in a rounded lobe ; first joint longer than that of preceding 

 pair, front margin not spined above ; in other respects the joints very similar to those 

 of the preceding pair, the third a little less expanded. 



Fifth Perieopods. — First joint very large, upper and front margins nearly straight, 

 hinder very convex, the narrowed part below partly overlapping the third joint, front 

 margin spined nearly to the top, hinder serrate, this joint much longer than the other 

 five united ; spines on both margins and some setee on the front margin of the expanded 

 third joint, which is produced downwards behind ; the fourth joint short, the fifth 

 subequal in length to the third, the finger slender, slightly curved at the tip, not 

 stumpy as it happened to be abnormally in the specimen figured. 



Pleopods. — The cleft spines form a row of five in the first pair, of four in each of the 

 following pairs. The round-headed spines on the peduncles of the first pair appeared 

 to have three retroverted teeth. The joints of the rami numbered from fourteen to 

 seventeen. 



Uropods. — Peduncles of first pair longer than the rami, outer ramus with four 

 spines along the margin, longer than the inner, which has two spines ; both peduncles 

 and rami microscopically pectinate ; peduncles of the second pair slightly longer than 

 the rami ; outer ramus longer than inner and with more numerous spines ; third pair 

 with the rami broadly lanceolate, a little longer than the peduncles, each spined on one 



(ZOOL. CHALL. EXP. — PAET LXVII. — 1887.) XxX 87 



