REPOKT ON THE AMPHIPODA. 857 



the second is mucli expanded distally, fringed with setse along the inner margin, and 

 carrying some groups on the surface ; the third joint expanded distally, is crowded, except 

 near the base, with groups of serrate spines ; the finger has its lower border prolonged a 

 little beyond the base of the nail, carrying a cilium in the incision thus produced. 



First Gnathopods. — Side-2:)Iates broader than deep, projecting much forwards, with 

 much of the upper margin free, the front shorter than the hind margin, the front and 

 lower both fringed with long setse ; perhaps homologically the upper is the front margin, 

 the lower being bent round to take the place of the true front ; the first joint reaching 

 below the side-plate, channelled along the front, some groups of seta3 on the inner surface 

 and about the somewhat expanded distal portion ; the second joint short ; the third 

 without any free front margin, the hinder carrying groups of setaj, and a little produced 

 on the outside with setse upon this apical process ; the wrist longer than tlie third joint, 

 with groups of setse on the front margin and near the hind margin on the inner surface, 

 the lower hinder part forming a large bent process, the border and inner surface of which 

 are armed with spine-like setse, this process giving the wrist the not uncommon cup- 

 shape ; the hand much longer than the wrist, broad, oval ; the long palm, defined close 

 to the apex of the wrist-process by two spines and bordered with numerous setse, occupies 

 the greater part of the hind margin ; groups of setse of different lengths are set upon the 

 inner surface of the hand near each margin ; the finger is strong, long, and curved to 

 match the palm, its edges are smooth, except for the small dorsal cilium near the base. 



Second Gnathopods. — Side-plates longer than broad, narrower than those of the 

 preceding pair, fringed like all the others with setse below. The limb in its details 

 closely resembling the first pair, but with the joints somewhat longer, and the lower edge 

 of the third joint fringed with strong unequal spines, which were not observed in the 

 other gnathopods. 



First Perwopods. — Side-plates a little broader than those of the preceding seg- 

 ment. Marsupial plates very long and fringed with numerous long setse. First joint 

 of the limb reaching beyond the side-plate, carrying setse on both margins, on the 

 serrate hinder margin several that are very long as well as some that are shorter ; the 

 second joint short ; the rest of the limb broken off. 



Second Perxopods. — The side-plates rather longer than the preceding pair, pretty 

 deeply excavate behind, the setiferous lower margin running with a continuous curve up 

 to the point at which the excavation ceases. The marsupial plates like those akeady 

 described. The first joint of the limb reaching beyond the side-plate, resembling that of 

 the first peraBopods ; the third joint al)out half the length of the first, not decurrent or 

 scarcely so, carrying on the serrate hinder margin four or five groups of spines and setse, 

 and a group at the apex before and behind ; the following joints broken off. 



Third, Perxopods. — The front lobe of the side-plates much larger than the hinder one. 

 The branchial vesicles with a narrow neck, thence expanding rapidly with a triangular 



(ZOOL. CHALL. EXP. PART LXVII, — 1887.) Xxx 103 



