REPORT ON THE AMPHIPODA. 827 



MaxilUpeds. — luner plates not reaching quite the end of the first joint of the palp, 

 caiTying on the apical margin two or three slender spine-teeth and some small seta3 ; 

 the outer plates not equalling in breadth the second joint of the palp, nor reaching so 

 far forward, the inner margin armed with setae and six or seven curved spines, increasing 

 in size successively to the apex ; the first joint of the palp short, with a seta at the 

 inner apex, the second joint long and broad, especially at the distal end, which forms a 

 produced lobe on the inner side ; much of its inner margin is bordered with bristles 

 directed backwards, and from its surface start some very long ones, the whole apparatus 

 of setse and spines in this pair of appendages making a ^^ry close network ; the third 

 joint longer than the first, expanded distally ; the finger narrow, curved, ending in a 

 little peak, from beneath which issue a thin spine and a cilium. 



The triturating organs of the stomach exhibit on the inner margin four or five 

 serrate teeth, more or less curved, and succeeded below by a tuft of long cilia. 



First Gnathopods. — Side-plates small, expanded below, the front part downy like 

 the back of the animal. The first joint reaching much beyond the side-plate, slender, 

 equal in length to the four following joints together, with some long setse on the hind 

 margin ; second joint very short ; third not much longer, distally pointed ; the wrist 

 longer and broader than the hand, its hind margin fringed with bristles of various 

 lengths, a row of these also on the surface, the lower margin making a sharp angle with 

 the hinder ; the cross-banding of the principal muscles in this joint very conspicuous ; 

 the hand oval, narrow at both ends, more bowed behind than in front, some setae or 

 seta-like spines on the hind margin and surface ; the finger thin, and long enough with 

 a slight inclination of the hand to touch the wrist, while what may be considered the 

 palm-margin is defined by a minute emargination and a spine with a long accessory 

 thread at about the middle of the hand's hinder margin. In the second specimen the 

 finger was longer and more curved than in that figured. 



Second Gnathopods. — Side-plates narrow, distally rounded, with a pocket in the 

 integument near the upper front border ; the front half of the surface very hairy. The 

 branchial vesicle long and narrow. The first joint reaching much beyond the side-plate, 

 longer than the branchial vesicle, but not so long as the four following joints united, 

 with some long setse on the hind margin ; the second and thii'd joints like those of 

 the preceding limb, the wrist more slender, with fewer setse, but both margins, as also 

 those of the hand and the upper margin of the finger, are lined with adpressed scale- 

 like cilia ; the hand shorter than the wrist, the hind margin not out-bowed, but forming 

 a definite angle at the beginning of the palm, occupied 1)y two palmar spines, against 

 which the small finger closes down over the ciliated palm ; both about the base and 

 about the tip of the finger the hand has several seta-like spines. 



First Perseopods. — The side-plates with convex front border, rounded below. The 

 first joint reaching below the side-plate, the second short, the third longer than the fourth 



