EEPORT ON THE AMPHIPODA. 957 



dentate, both set with groups of spines, which, as in the preceding and following joints, 

 are pectinate ; on the inner surface there are five spines of very unequal lengths ; the 

 hand is large, oval, narrowest distally, the long front margin smooth except for the apical 

 spines, one of which is pectinate, the hind margin almost absorbed by the long convex 

 palm, which is defined by a row of five strong palmar spines on the inner surface, and 

 three on the margin ; of the five the outermost is the longest, of the three the lowest ; the 

 palm- border is striated as in the genus Eusiroides, and crowded with submarginal pectinate 

 spines or spinules of various lengths ; there are also scattered spines or groups of spines 

 on both surfaces. The long curved finger closes over the whole palm, the inner margin 

 smooth, probably channelled. 



Second Gnathopods. — Side-j)lates small, rather broader than the preceding pair, 

 with convex lower margin, not produced forwards. The branchial vesicles narrow, not 

 so long as the first joint. The limb scarcely differing from that of the first gnathopods, 

 except that the third joint, the process of the wrist, the hand, and the finger are rather 

 longer. 



First Perseopiods very slender, as are all the perseopods. Side-plates like the 

 preceding pair. Branchial vesicles longer than the preceding pair, widening a little 

 near the distal end, as long as the first joint. First joint evenly narrow, with some 

 small spines along the front margin and at the hinder apex ; the second joint very 

 short, with a spinule on the hind margin and spines at its apex ; the third joint not 

 quite two-fifths the length of the first, not decurrent in front, with small spines on the 

 hind margin at five points ; the remainder of the limb missing. 



Second Per&opods. — Side-plates broader than the preceding pair, excavate behind 

 to some depth, the lower margin straight, with a small tooth where it meets the 

 curve of the hind margin. The branchial vesicles like the preceding pair. The limb 

 defective as in the first perseopods ; no spinule on the hind margin of the second 

 joint. 



Third Perseopods. — Side-plates as broad and not much less deep than the preceding 

 pair, the front lobe rounded, the hinder more shallow and a little serrate. The branchial 

 vesicles nearly as in the preceding pair, but a little more regularly oval. The first 

 joint of the limb very small, the front margin very slightly convex, with one or two 

 spinules, the hind margin toothed for four spines, apically acute, the lower margin with 

 a small rounded lobe in front, the hinder part straight ; the second joint very short, 

 unarmed ; the third joint long and slender, three times as long as the first, slightly 

 curved, with small spines along the margins, the apex sharply decurrent behind, and 

 carrying two larger spines. The rest of the limb missing. 



Fourth Perseopods. — The side -plates with a hind lobe produced downwards, its 

 lower corner serrate. Branchial vesicles smaller than the preceding pair. First joint 

 similar in shape to that of the third perseopods, rather larger, with a few spines along 



