REPORT ON THE AMPHIPODA. 775 



being tlie chief part of the joint, its distal margin truncate and at the corners serrate, its 

 hinder surface thickly set with groups of spines ; tlie margins serrate ; the hand very 

 large, its long convex front margin smooth, ending in a sharp apex to which several setae 

 are attached ; the hind margin apart from the palm scarcely more than a third the length 

 of the front ; the long convex palm is serrate, more and more deeply as it approaches the 

 hinge of the finger, which is strong, curved, closing over the palm and reaching a small 

 pocket on the inner surface of the hand just above the palm margin ; a row of setae 

 traverses the hand's inner surface from the base across to the hinge of the finger. 



First Perasojjods. — Side-plates deeper than broad, less broad than the preceding pair, 

 hind margin longer than the front, both convex, lower margin straight (see fig. pr. 

 segm. 3). Branchial vesicles as long as the first joint Init much broader, widening 

 distally. The marsupial plates a little longer than the first joint, of the same width with 

 it, fringed with long setae. The limb narrow, the first joint reaching much beyond the 

 side-jjlate, almost unarmed ; second joint short ; third joint longer than the fourth or 

 fifth, with the apex in front sharp, decurrent, armed with a spine, toothed on the inner 

 side ; the fourth joint shorter than the fifth, with some minute marginal spines ; the fifth 

 joint mth a row of fourteen very small spines on the straight hind margin ; the finger 

 sharply pointed, not half the length of the fifth joint. 



Second Perseopods. — The side-plates broader than the preceding at the point where 

 the hind margin forms its rounded angle, the upper part of the margin being very slightly 

 concave, and the longer lower part as slightly convex. The branchial vesicles broader 

 than in the preceding pair ; the marsupial plates and the limb in agreement with that 

 pair. 



Third Perasopods. — The side-plates broader than the preceding pair, the hind lobe 

 rather deeper and less broad than the front. The branchial vesicles very broad distally, 

 larger than the first joint of the limb. The marsupial plates rather shorter than the 

 preceding pair. The first joint of the limb oval, much narrower below than above, with 

 much of the front margin flattened, fringed with about a dozen very small spines, the 

 convex hind margin almost imperceptibly serrate ; the second joint short ; the third joint 

 subequal in length to the fifth, the apex behind sharp, minutely bidentate, -^ith two 

 little apical spines ; there are one or two little spines high up on the hind margin, and 

 four or five on the front ; the fourth joint, which is much shorter than the fifth, has spines 

 at five points of the front margin ; the fifth joint has spines at twelve points ; the finger 

 is curved, sharply pointed, about half the length of the fifth joint. 



Fourth Perieopods. — Side-plates less broad than the preceding pair, the hind lobe a 

 good deal deeper than the front, the front margin straight. The branchial vesicles at the 

 centre nearly as broad as long. The first three joints of the limb similar to those of the 

 preceding pair but larger, the front margin of the first joint more, and the hind margin 

 less, convex than in that pair. The remainder of the limb missing. 



