REPORT ON THE AMPIIIPODA. 1111 



small spine, and the rounded hinder corner has three. The first joint is almost wholly 

 clear of the side-plate, distally a little widened, the convex hind margin carrying on 

 the lower part three serrate seta-like spines and some spinules ; the second joint short, 

 with an apical group of spines ; the third joint with the front margin very convex, the 

 hind margin serrate, carrying three groups of pectinate spines ; there are two acute 

 apices, between which more pectinate spines protrude from the inner surface ; the wrist 

 is as long and broad as the hand, the front margin with only an apical group of spines, 

 the hind margin serrate, closely fringed with long spines pectinate on two edges, the 

 inner surface also carrying several groups ; the hand is dilated towards the palm, has 

 four groups of spines along the serrate hind margin, and six groups along the convex 

 front margin, besides scattered spines on the inner surface and groups near the palm- 

 border ; many or most of these spines are pectinate ; the palm-border is almost at right 

 angles with the hind margin, finely pectinate, slightly convex ; the finger is curved, the 

 inner margin smooth, with half-a-dozen minute submarginal setules, followed by two 

 longer setules such as are commonly found at the base of the nad, the inner margin of 

 the finger being here doubled, though there is no transverse mark to indicate the com- 

 mencement of the nail ; the termination is formed by a sharp spine, only half of which 

 projects beyond the apex of the finger. 



Second Gnathopods. — Side-plates broader than deep, with convex lower margin. 

 First joint almost entirely free from the side-plate, much shorter and narrower than the 

 hand, the hind margin convex, the front a little concave, with a group of spines a little 

 above the apex, which projects beyond the short second joint, the third joint oblong, 

 with some small spines at the apex of the straight hind margin ; the wrist not nearly 

 so broad as the hand, much broader than long, distally cup-like, with a group of spines 

 at each apex, the short hind margin as well as the longer front one being otherwise 

 smooth ; the hand of great size, widest at the palm, where the width falls not far 

 short of the length, the hind margin nearly straight, with some small groups of spines; 

 the front margin on leaving the wrist very convex, afterwards straight and carrying 

 some small groups of spines ; the palm at right angles to the front and hind margins, 

 much sculptured, beginning with the apical tooth of the hind margin, the interval 

 between this and the following tooth being occupied by one or two small palmar-spines 

 and a group of short slender spines ; there is then a rather deep cavity with four or five 

 spinules on its border, the remainder of the palm being convex, deeply serrate so as to 

 form four rather distant teeth, the oblique intervals being set with several slender spines 

 and spinules ; the finger curves over the palm to its extremity and has a smoothly 

 concave (perhaps in part microscopically spinulate) inner margin with submarginal 

 setules, whde the convex outer margin has at intervals five or six groups of small and 

 slender spines besides a dorsal cilium near the base ; the nail is not slender, but apically 

 acute ; there are some scattered spines singly or in small groups on the surface of the hand. 



