EEPORT ON THE AMPHIPODA. 645 



figure it should be noticed that the inner plates are not flattened out to their full extent, 

 the outer part being folded back against the outer plate ; similarly it should be noticed 

 that there is a folding over of the outer edges of the second and third joints of the palp. 

 The dilated palp of the first maxillse, likewise, when in situ, was far from being in the 

 same plane with the rest of the maxilla. 



First Gnathoiwds.- — Side-plates more than twice as long as broad, with a convex 

 front margin projecting over the base of the lower antennae, hind margin nearly straight. 

 First joint equal in length to the three following united, projecting considerably beyond 

 the side-plate, a little expanded below, with some seven setse on the front margin ; second 

 joint shorter than third ; third nearly equal in length to the hand ; wrist longer than 

 the hand, like the third joint having setse on the hind margin ; hand long-oval, with 

 setae in various parts, especially several groups on the hind margin, the lower half of 

 which is marked ofi" as a palm rather by its pair of spines than by any break in the 

 convexity ; the spines are of unequal length, the palm-margin is ornamented by being 

 cut into a series of sharp straight denticles, below which are small cilia ; the finger is 

 curved to fit the palm ; it has a dorsal cilium near the base, and the tip of the finger 

 appears as if formed of two plates laid one upon the other, as though the finger itself 

 ran out to a point, and had a small triangular process (the nail) laid within the point. 



Second Gnathoioods. — Side-plates similar to those of the preceding pair, the bind 

 margin rather less, and the front rather more, convex ; first joint as long as the three 

 following united, a little expanded and bent below, numerous set« on the front margin ; 

 second joint much longer than third, smooth ; third joint furred behind, with a few 

 spines on the squared apex ; the wrist longer than the second joint, very much furred 

 behind and before, with spines on both the somewhat sloping sides of its apex ; hand 

 subequal in length to the third joint, narrow at base, but immediately expanding, wddest 

 at the palm, hind margin straight, front very convex, much furred on both sides, 

 pectinate spines near the outer angle of the palm and round the hinge of the finger, the 

 palm concave, not a thin edge but broad and set through most of its course with several 

 rows of short sharp teeth, its sides also fringed with cilia and rows of pectinate spines, 

 the pectinate spines having a short terminal piece abruptly narrower than the shaft, with 

 a shorter accessory thread by its side ; the finger is sickle-shaped, the much-curved inner 

 margin being hairy, with cilia near the origin of the finger. The finger here is as strong 

 as that in Euonyx chelatus, Norman. 



First Perwopods. — Side-plates larger than those of the preceding segment, hind 

 margin straight, front but little curved. Marsupial plates long, slender, the setse 

 extending along most of the front border. Branchial vesicles without folds, from a 

 narrow neck expanding at once greatly for some distance, and then very much more to 

 the long almost straight distal margin. The first joint of the limb broad, extending a 

 little beyond the side-plate, with some setai on the front margin ; second joint short. 



