REPORT ON THE AMPHIPODA. 1235 



serration apically ; the first joint of the palp is not much longer than broad, with two 

 or three setae near the apex of the almost straight inner margin ; the second joint nearly 

 twice as long as the first, the inner margin fringed with setae, of which there are also 

 groups on the inner surface, the third joint widening from the base, the apical margin 

 oblique on the inner side and fringed with setse, on the outer side carrying a setule, and 

 with its rounded edge overlapping the base of the fourth joint ; the fourth joint longer 

 than the third, curved, pointed, a little ciliated, and having a small dorsal cilium very 

 near the base. 



Triturating Organs. — These are small, not regularly oval, apparently without any 

 armature except a row of seven or eight rather broad, slightly pectinate spines, along a 

 margin which slightly projects. 



First Gnathopods attached just where the segment coalesces with the head, close 

 to the base of the maxillipeds ; the first joint narrow at the base, widening distally, 

 not greatly longer than the hand in the male ; the second joint rather longer than 

 wide ; the third not much longer than the second, somewhat rhomboidal, with a group 

 of spines at the slightly furred hinder apex, and others on the surface ; the wrist 

 narrow at the base, then widening, shorter than the hand, with numerous setiform 

 spines on the surface and along the hind margin ; the hand abruptly wider than the 

 wrist, tending to oval, narrowest distally, with several groups of spines on the surface 

 near the front margiu, the hind margin, as distinct from the palm, short, ciliated ; the 

 palm-border long, convex, fringed on both sides with short spines and setules, the 

 cavity at its junction with the hind margin of the hand being set round with five 

 unecpial palmar spines, larger than those along the border ; the finger large, curved, 

 matching the palm, with some small cilia on the inner margin, and a very small dorsal 

 cdium near the hinge. The hand in the female is rather smaller than in the male. 



Second Gnathopods. — Attached, in the male, close to the hinder end of the 

 segment, which is here abruptly dilated, and bulbous in the lateral view ; in the female 

 the attachment is near to the front end of the segment, which from this point of 

 considerable dilatation narrows backwards ; the first joint narrow, widening a little 

 distally, of great length in the male, more than twice as long as in the female, being 

 nearly three and a half times as long as the branchial vesicle in one sex to once and a 

 half in the other ; the second joint short ; the third in the male about twice as long 

 as the second, but scarcely so much in the female ; narrow at each end ; the wrist 

 narrow, of very great length in the male, sometimes even longer than the first joint, 

 though sometimes shorter, in the female shorter even than the third joint, almost 

 triangular ; the hand oval, long and stout, the base in the male a little narrowed, the 

 front margin almost unarmed, as likewise the much shorter hind margin ; the long 

 convex palm beginning with an emargination, of which the tips are serrate, and on 

 either side of which large palmar spines are planted ; beyond this the border is fringed 



