REPORT ON THE AMPHIPODA. 863 



joint of the palp, with groups of plumose setae on or within the upper part of the inner 

 margins, the distal margins broad, sloping outward, carrying two pairs of short teeth 

 on one of the plates, on the other a pair of teeth and a tooth and a spine ; these 

 are followed by seven or eight long spines bending inwards ; the outer plates narrow, 

 reaching but little beyond the first joint of the palp, Avith the inner edge smooth for 

 some distance, and then irregularly denticulate to the ajjex, which forms a tooth, 

 beyond which the distal margin rises in a curve, set closely round with long curved 

 spines to the number of fourteen or fifteen, which are successively longer and thinner, 

 so that those which pass down the outer margin are rather feathered seta3 than 

 spines ; there are several setiform spines on the surface within the inner margiu ; the 

 first joint of the palp is short, its inner margin extremely so ; the second joint is 

 elongate, carrying on both surfaces near the inner margin numerous groups of spines, 

 many of them long and pectinate on two or three edges ; there is also a group at the 

 middle, and at the apex, of the outer margin ; the third joint is much longer than the 

 first, and thickly set on both margins and at the apex with large groups of pectinate 

 spines ; the finger is long, curved, sharply pointed, longer than the first, but shorter 

 than the third joint, with a small cilium at the nail, both edges and probably the whole 

 joint covered with short down. 



First Gnatliopods. — The side-plate short, not overlapping the head, its front 

 margin at the lower part sloping backwards, the lower margin a little concave, and the 

 hinder sinuous, fringed with short spines. The first joint projecting much beyond the 

 side-plate, not so long as the hand, its front margin nearly straight, the distal half 

 of the hinder much out-bowed, and the whole fringed with setiform spines, and the 

 lower margin, which at the rear projects beyond the second joint, also set round with 

 spines, the front part of the inner surface covered with groups of setae ; the second 

 joint short, like the first having its distal margin furnished with numerous setiform 

 spines, some very long ; the third joint irregularly oblong, no part of the convex front 

 margin free, carrying a group of spines on the inner surface ; there is also a bunch of 

 spines near the apex of the hind margin, which itself is embowered in spines rising on 

 the surface near it ; the wrist large, about as long as the first joint, the wing widening 

 distally, but not reaching so far as the front margin of the joint, thickly set round with 

 long serrate spines, besides having numerous grouj)s of them on the inner surface, 

 supported by other groups near the front margin on both surfaces, the lower margin of 

 the wing concave and channelled near the attachment of the hand ; the hand a very 

 elongate oval, broadest about the centre, nowhere so wide as the wrist at its widest, 

 and abruptly narrowed at the hinge of the finger, with many groups of spines or setae 

 on the inner surface near each margin; the palm includes without any precise definition 

 almost the whole of the hind margin, and is armed as well with long and short serrate 

 setiform spines as with several short stout spines, for the insertion of all which a 



