REPORT ON THE AMPHIPODA. 1421 



Maxilla? similar to those in the genus Ilyperia. 



Maxillipeds. — The inner plate tolerably elongate. 



First Gnathopods. — First joint a little widened at the upper part ; the second joint 

 with slender spines about the hinder apex ; the third joint not much longer than the 

 second, with front apex acute, resting on the wrist, the hinder apex having three or four 

 pectinate spines ; the wrist longer than the hand, having pectinate spines at two points 

 of the convex front margin, the hind margin fringed with several spines, some being at 

 the apex, which projects a little squarely behind the hand ; the hand much wider at the 

 base than the apex, with spines at five points of the very convex front, the hind margin 

 nearly straight, strongly pectinate with about twenty teeth ; the finger curved, more 

 than half the length of the hand, its concave inner margin pectinate with slender teeth 

 for more than half its length. 



Second Gnathopods. — Branchial vesicles shorter but broader than the first joint. 

 The first joint widening a little distally, its front margin not bulging ; the third joint 

 much longer than in the preceding pair, having no acute apex, most of it surrounded 

 with spines ; the proximal part of the wrist rather longer than the hand, the apical 

 process behind three-quarters of the hand's length, fringed within with fine pectination 

 and with spines, of which a strong one at the apex reaches beyond the apex of the hand ; 

 the hand rather longer and narrower than in the first pair, similarly armed ; the finger 

 pectinate. 



First Perseopods. — The first joint with narrow neck, then widened, having spines at 

 three points of each margin, those of the more convex hind margin all rather near the 

 apex ; the second joint with two spines on the slightly furred hind margin ; the third 

 joint with spines at four points of the hind margin, which is strongly furred ; the apex 

 of the front is produced downwards and armed with spines ; the fourth joint is consider- 

 ably longer than the third, with spines at three points of the slightly convex front 

 margin ; the hind margin nearly straight, strongly furred, having several spines on or 

 near it, distally projecting beyond the fifth joint, and the distal margin minutely pectinate ; 

 the fifth joint rather longer than the fourth, the hind margin pectinate, the front 

 convex ; the finger curved at the tip, more than half as long as the preceding joint, 

 having a little pectination of the inner margin. 



Second Perseopods longer than the first, the fifth joint not longer than the fourth, 

 the finger about half the length of the fifth joint. 



Third Perseopods. — The first joint channelled and straight behind, the front margin 

 with spines at eight points of the widened lower part of the joint ; the second joint 

 with a spinule and small spine on the front margin ; the third joint elongate, with two 

 spines and a spinule on the faintly pectinate front margin, and two or three spines at 

 the slightly downdrawn hinder apex ; the fourth joint much longer than the third, 

 scarcely narrowed distally, with four spines spaced along the pectinate front margin, two 



