REPORT ON THE AMPHIPODA. 1165 



spinules, the hind margin convex, with a slender spine at the apex ; the second joint as 

 broad as long, with a similar spine near the apex ; the third very little longer than the 

 second, with some spines on the rounded hind corner, and long ones projecting from the 

 surface on the distal margin ; the wrist a little longer and distally a little broader than 

 the hand, the convex front margin smooth, with a group of spines on the apex ; the hind 

 margin jutting out when free from the third joint, then straight, serrate, carrying six 

 groups of spines, some strongly denticulate except at the distal part ; on the surface at 

 some distance from this margin is a group of two followed by a row of five spines ; the 

 convex front margin of the hand has seven groups of long curved spines on or near it ; 

 the hind margin juts out a little from the base, but not far enough to bring the slightly 

 convex palm-margin on a level with the hind margin of the wrist ; the palm-margin has 

 two little projecting teeth, the distal end serrate, and six or seven groups of spines like 

 those on the wrist ; planted on the surface a little remote from the margin, but pro- 

 jecting beyond it, there are three strong spines apart from one another; the finger 

 matches the palm ; there is a rather long dorsal cilium near the base, the inner margin 

 almost straight, and at first almost smooth, then becoming more and more strongly 

 pectinate, and forming a strong decurrent tooth near the base of the slightly inflected 

 nail, there being two short and two long setules in the neighbourhood of the tooth. 



Second Gnathopods. — The side-plates broader than deep, with some setules in front, 

 much shallower behind than in front. Marsupial plates narrow, shorter than the first 

 joint, having seven long setse. The first joint expanded on the outer side, with a convex 

 front margin fringed with slender spines and spinules, but the front margin of the unex- 

 panded inner surface resembling that in the first gnathopods ; the second joint as in the 

 preceding pair ; the third joint rather longer, with some spines of various lengths along 

 the distal part of the convex hind margin, and some short spines on and projecting from 

 the surface beyond the truncate distal margin ; the wrist triangular, longer than in the 

 preceding pair, very similar in armature ; the hand as long as the wrist, narrowly oval, 

 narrower distally than at the base ; the armature very similar to that in the first 

 gnathopods, but the groups more widely spaced ; the finger a little longer, its inner margin 

 more curved, denticulate. 



First Perseopods. — Side-plates broad and shallow. Branchial vesicles a very elongate 

 oval. Marsupial plates like the preceding pair. First joint of the limb free from 

 the side-plate, very large, packed with gland-cells, longer than the next four joints united, 

 broader above than below, articulated almost, at the top of the hind margin, the front 

 squarely and very prominently angled, the sides carrying several marginal spinules, and 

 the angle two or three feathered setse ; the lower margin projects beyond the second 

 joint ; a long transverse slit crosses the surface of the joint from the front almost to the 

 rear near the centre ; the second joint broader above than below, rather longer than 

 broad, with some spinules at either apex ; the third joint shorter than the second, 



