REPORT ON THE AMPHIPODA. 1205 



many longer spines planted submarginally in groups or singly ; the apical margin forms 

 an obtuse angle with the inner ; the convex outer margin is quite smooth ; the first 

 joint of the palp is broad, with two or three groups of spines near the rounded outer 

 apex ; the second joint is not quite twice as long as the first, very broad, with three 

 groups of spines adjacent to the outer margin, the convex inner margin crowded 

 with long spines till near the apex, and at this part the rows of spines are set on 

 the inner surface a little way from the margin, beyond which they greatly project ; 

 the third joint rather longer than the first, widening from the base, with the distal half 

 on the front margin and over the inner surface, especially at the apex, set thickly with 

 long spines ; the finger slender, tapering, little curved, subequal in length to the third 

 joint, a small spine-like nad forming the acute tip; the dorsal cilium at a little distance 

 from the base. 



The triturating organs of the stomach show on one side a row of short stout acute 

 spines, within which is a longer row of about twenty-five longer spines, stout, apically 

 denticulate, in a semicircle, the opposite side of the semicircle (or oval) occupied as 

 usual by numerous slender spines, and some of this character rise from the inter- 

 mediate surface. 



First Gnathopods, — The side-plates small. The first joint almost entirely free from 

 the side-plate, shorter than the wrist or hand, with a long spine near the centre of the 

 hind margin ; the second joint short, with a large group of long spines at the apex of the 

 hind margin ; the third joint rather longer, with several groups of spines along the serrate 

 hind margin and the oblique distal margin, which has an acute apex in front ; the wrist 

 longer and broader than the elongate hand, narrowing a little distally, with six or seven 

 groups of small spines near the smooth, slightly convex front margin ; the hind margin 

 tending to concave, set all along with groups of spines, about fourteen groups or pairs of 

 groups, the spines of different lengths in each group, some near the apex of the joint of 

 very great length, finely pectinate ; the hand long and narrow, curved, with ten groups 

 of spines on the concave serrate hind margin, the spines varying in length, many of great 

 length and pectinate ; the convex front margin has some spines near the apex, and at the 

 apex a group of very long and strong spines, strongly pectinate ; the finger is slender, 

 half the length of the wrist, as long as the apical spines of the hand, curved towards the 

 apex, with setules at five or six points of the inner margin, a group near the base of the 

 nad, a dorsal cilium near the hinge, and also three or four setules along the front 

 margin. 



Second Gnathop>ods. — The side-plates rather larger than the preceding pair. The 

 branchial vesicles a little longer and considerably broader than the first joint, much 

 longer than broad. Marsupial plates much longer and broader than the branchial 

 vesicles, and like them with one margin nearly straight, the other convex, the end 

 rounded ; there are long setse all round, but none equalling the greatest breadth of the 



