REPORT ON THE AMPHIPODA. 1381 



widening almost at once from the narrow neck, carrying a spinule at the apex of the hind 

 margin ; the short second joint with its hind margin longer than the front ; the third 

 joint much shorter than the fourth, widening distally, the hind margin smooth except for 

 a cilium at the centre and a small spine near the apex ; the fourth joint not quite so long- 

 as the fifth, the front margin convex, smooth, the hind margin straight, fringed with 

 little thin spinules, and having one spine near the apex ; the fifth joint narrower, slightly 

 curved, the little spinules fringing the hind margin being here more decurrent ; the 

 finger more than half the length of the fifth joint, slender, curved, a little bulbous at the 

 base, both margins smooth, or with a little submarginal pectination near the base of the 

 inner edge. 



Second Perseopods very similar to the first, but with the first joint and the last three 

 joints rather longer, the fourth and fifth equal in length, the armature as in the other 

 pair. 



Third Perseopods. — First joint a little expanded but not very widely, wider below 

 than above, scarcely longer than the third and fourth joints together, the hind margin 

 smooth, the front at first smooth, then serrate, more strongly and closely so as it 

 approaches the apex ; the second joint short, with a spinule at the front apex ; the third 

 joint longer than in the preceding perseopods, with a few spinules along the front margin ; 

 the fourth joint much longer than the third, the front margin fringed with little spinules, 

 there being here as elsewhere a longer spinule or setule at intervals, planted within the 

 margin; the fifth joint longer than the fourth, armed in like manner; the finger very 

 slender, apically curved, not half the length of the fifth joint, the front margin below the 

 bulb being pectinate for nearly a third of the finger's length. 



Fourth Perseopods rather larger and longer than the third ; the first joint having on 

 one limb four, on the other limb five, spines at intervals along the middle of the front 

 margin, which is serrate below ; the other joints are armed as in the preceding pair; the 

 fifth joint in particular has a greater length. 



Fifth Perseopods shorter than the third, armed like the fourth. The first joint 

 broader above than below, broader than in either of the preceding pairs ; the fourth joint 

 shorter than the third, very much shorter than in the preceding pairs ; the finger half 

 the length of the fifth joint, pectinate along nearly half of its inner margin. 



Pleopods. — The peduncles stout ; the coupling spines small, with acute apex and 

 four teeth on each margin ; the first joint of the inner ramus not very long, 

 narrow at the base, and widened below, its inner margin ciliated, the cleft spine 

 with slender not very unequal arms ; the first joint of the outer ramus carrying 

 four or five plumose setss on the outer margin and having an interlocking process on 

 its surface ; the joints of each ramus eight in number, the joints not elongate, the 

 accompanying pairs of setse rather stout. 



Uropods. — Peduncles of the first pair longer than the rami, the outer margin 



