REPOKT ON THE AMPHIPODA. 9(57 



within it, besides strong transverse groups on the inner surface and round the apical 

 margin ; the inner margin of the finger armed with three or four graduated spines, each 

 having an accessory thread, the largest spines nearest the slender curved nail, at the base 

 of which there is a cilium and a small decurrent spine ; the finger has a dorsal cilium near 

 the base of the nail. 



First Gnatliopods. — Side-plates much broader below than above, extending forwards 

 to the base of the lower antennae, the rounded front angle having a little indent, not a 

 tooth, the hinder angle forming a sharp tooth, the slightly convex lower margin fringed with 

 some setules; the first joint reaching much beyond the side-plate, the front margin a little 

 concave, armed below with some long and strong spines, the hind margin convex, nearly 

 smooth ; the second joint w T ith some small spines at the apex of the hind margin, the 

 apex in front on either side forming an angle ; the third joint short and broad, with spines 

 along the lower part of the hind margin and the hind part of the squared distal border ; 

 the wrist with a very long front border, fitting when bent upwards into the channelled 

 front of the first joint, the hind border very short, covered with a brush of serrate spines, 

 not produced into a heel ; the distal margin forming a large unsymmetrical cup, with a 

 few spines at the hinder part ; in this cup the great egg-like hand is seated, attached to 

 the antero-distal end of the wrist ; the front margin of the hand is smoothly convex, 

 much shorter than the palm, but much longer than the free portion of the hind margin ; 

 the hind margin ends in a group of nine or ten very unequal but strong palmar spines, 

 the integument near them showing some small scale-markings ; the palm margin is 

 smoothly convex, with another border within it on either side, these inner borders being 

 fringed with spines or spinules abruptly narrowing at the distal portion, and being there 

 pectinate ; on the outer surface these spines are set obliquely, alternately larger and 

 smaller, but nearly all the same size, on the inner surface they stand straight, and the sizes 

 differ much ; the long thin finger fits closely round the whole palm-margin, for which 

 its inner edge appears to be channelled ; it is smooth except for some very small hairs on 

 the inner margin, and a small dorsal cilium near the hinge. 



Second Gnatliopods. — Side-plates a little deeper than the preceding pair but narrower, 

 a little wider above than below, with a small tooth at each end of the lower margin, the 

 hinder one being the stronger. The large branchial vesicles of this and the four 

 following pairs have a slender accessory vesicle springing from the same base as the 

 principal sac, but not attaining the same length. The limb in most respects resembles 

 that of the first gnathopods ; the first joint rather longer, without the great spines 

 near the lower front angle ; the third joint rather longer, with fewer spines on the hind 

 margin ; the wrist rather larger. 



First Peraeopods. — Side-plates a little larger than the preceding pair, sides nearly 

 parallel, the lower margin with some setules and with a tooth at each corner. Branchial 

 vesicles larger than the side-plates, much inflated. Limb slender; first joint reaching 



