REPORT ON THE AMPHIPODA. 1001 



right mandible appeared to be simply convex, with one tooth or division at the lower 

 end ; its secondary plate is very small, widest distally, the distal margin being cut into 

 several little teeth, and having a deep notch near the lower end, from which the denticles 

 form a return row ; there appeared to be two strong but not elongate spines on the spine- 

 row, planted amidst a brush of cilia ; the palp is remarkably long ; the first joint short ; 

 the second very long, curved near the base, narrowing distally, fringed with long setiform 

 spines, slightly plumose; the third joint long and narrow, more than half the length of 

 the second joint, tipped with four or five long setiform spines. 



The Loiver Lip rather deep, the texture of extreme tenuity, distally finely furred; 

 the mandibular processes narrow, divergent. 



First Maxillas. — The inner plate not ascertained ; the outer plate having on the 

 distal margin eight long spines, on which the lateral denticles did not appear to be either 

 strong or numerous ; the first joint of the palp is short, the second joint widening distally 

 and curving over the outer plate, having on the distal margin seven spine-teeth, followed 

 by six slender spines descending the serrate inner margin. 



Second Maxillse. — The inner plate broad at the base, tapering to a narrow truncate 

 apex, on which there are three plumose seta}, the outermost very strongly feathered ; the 

 inner margin is fringed with about fourteen strong plumose setae ; the outer plate is 

 very little longer than the inner, narrower except at the apex, which, as in the inner 

 plate, has three long plumose setae, the middle one perched on a little eminence beyond 

 the other two, the outermost the strongest and most strongly feathered. 



Maxillipeds. — Narrow (not in good order for examination). The inner plates appear 

 to be very small, carrying some setae on the inner margin and apex ; the outer plates very 

 long, but not reaching nearly to the apex of the palp's second joint, with some slender 

 spines at distant intervals along the inner margin, and some strong curved spine-teeth on 

 the apical margin ; the palp very elongate, apparently both the first and second joints 

 very long, the second rather the longer, both with many long setas ; the third joint 

 not specially long, widening distally, carrying numerous setae on both margins and the 

 surface ; the finger shorter than the third joint, scabrous, little curved, most so at the 

 naU. 



First Gnathojyods. — The side-plates a little broader than deep, the front margin 

 tending to concave, the lower margin straight, with a setule near the front corner. The 

 first joint long, widening distally, attached near the lower hind corner of the side-plate, 

 channelled in front, the front margins being concave, the hind margin convex ; the 

 second joint short, rounded in front, with some setiform spines near the apex of the hind 

 margin ; the third joint triangular, the hind margin considerably longer than the front, 

 produced into a point lying close to the wrist, having a few setiform spines not far above 

 the apex ; the wrist channelled behind, slender, longer than the third joint, fringed on 

 both the hind margins with long, slender spines or setae ; the hand longer than the wrist, 



(zool. chall. exp. — part lxvii. — 1887.) Xxx 126 



