REPORT ON THE AMPHIPODA. 1021 



of the palp, carrying a row of ten plumose setae, which from the upper part of the inner 

 margin pass towards the outer apex ; round the apical margin there is a row of eight 

 plumose spines, followed by some elongate spine-teeth, with two short spine-teeth at the 

 inner corner, these details being made out with some difficulty owing to the crowding of 

 the garniture ; the outer plates not nearly reaching the apex of the second joint of the 

 palp, with ten graduated spine-teeth along the inner margin, followed without interruption 

 by five on the apical border, the last of which is very long, and succeeded in turn by seven 

 long setae ; the second joint of the palp is about twice the length of the first, fringed along 

 the inner margin with many setae or setiform spines ; the third joint rather longer than 

 the first, with many groups of spines or setae about the distal half, apically produced on 

 the outer side in a small ciliated process ; the finger about as long as the third joint, with 

 a slender nail, five or six setules along the distal half of the inner margin, and a small 

 dorsal cilium not far from the base. 



First Gnathopods. — Side-plates longer than broad, outdrawn below in front, the 

 lower margin not serrate, but bearing some setae and setules. The first joint reaching 

 much beyond the side-plate, with many long setae on the hinder margin, chiefly at the 

 upper part, and a row on the surface directed forwards ; the second joint with two 

 groups of setae on the hind margin ; the third rhomboidal, with the lower border pointed 

 behind, rounded in front, fringed with setae, of which there are also four groups along 

 the hind margin ; the wrist a little shorter than the hand, with a long group of setae at 

 the apex of the front margin, many groups along the free part of the hind margin, and 

 five groups on the inner surface ; the hand oblong, a little widened distally, with a group 

 of setae at the apex of the rather convex front margin, and another below the apex, 

 eight groups along the shorter serrate hind margin, nine passing obliquely across the 

 inner surface, and a sinuous line of forty-three, thirty-six of which are short and of 

 even length ; the palm, which is pectinate, slightly oblique and convex, is fringed with 

 setules, and has besides four groups of setae on the outer surface, a continuation of the 

 series on the hinder margin; the point of the finger closes down against a row of 

 four or five small palmar spines on the inner surface; the dorsal cilium is small, 

 near the hinge. 



Second Gnathopods. — Side-plates not outdrawn, but the front margin descending 

 below the hinder. Branchial vesicles with a narrow attachment, widening greatly, 

 equal in length to the first joint of the limb. The first joint not nearly as long as the 

 massive hand, distally lobed in front both on the outer and the inner side, some 

 long setae on the upper part of the inner margin ; the second joint distally lobed like 

 the first, in each case the outer lobe being larger than the inner ; the third joint oblong, 

 but with the hinder apex rather strongly produced, four groups of setae on the hind 

 margin ; the wrist very short and broad, cup-like, with many setae and spines on the 

 small hind margin; the hand swollen out to a greater width than the wrist, slightly 



