REPORT ON THE AMPHIPODA. 813 



the rounded apex smooth, eight or nine short, more or less spine-like, plumose setas along 

 the upper part of the inner margin ; the outer plate with ten longer spines round the 

 ujiper part of the inner and the apical margins, and a short spine at the top of the outer 

 margin. 



Maxilllpeds. — Inner plates broader than the outer, short, reaching a little beyond 

 the base of the first joint of the palp, with three spine-teeth and two spines on the apical 

 border ; the outer plates narrow, not reaching quite to the end of the first joint of the 

 palp, on the inner margin carrying a single spine, a pair of spines, five spine-teeth, 

 successively larger towards the apex, upon which is a long spine-tooth and a plumose seta ; 

 the first joint of the palp rather longer than the third ; the second joint considerably 

 longer than either, with the convex inner margin fringed with numerous slender spines ; 

 the third joint narrow, oval, with spines along the inner margin, on the surface near the 

 outer, and at the apex of the outer margin ; the finger slender, nearly as long as the 

 third joint, inner margin straight and smooth, a spine rather than a nail afiixed to the 

 apex, with an attendant cilium ; the dorsal cilium small, near the base. 



First Gnathopods. — Side-plates expanded in front below, hind margin nearly straight, 

 lower margin fringed with some fourteen partially feathered setae, leaving a thii-d of the 

 length in front unarmed except for a single cilium ; the first joint reaching the end of 

 the side-plate, with six long set^ along the central part of the convex hind margin ; the 

 second joint narrow, as long as the triangular third, of which the front margin is much 

 longer than the hinder one ; the wrist, a little shorter than the hand, to which it is 

 attached by a narrow neck, carries a few setas on the somewhat expanded part of the hind 

 margin just below the third joint ; the hand oblong, the front margin a little prolonged 

 at the root of the finger, where it has two or three cilia or setules ; the hind margin is a 

 little indented for its second setule a little below the apex ; the broad palm consists of a 

 small rounded lobe in front, beyond which the strong palmar spine a Httle projects, while 

 the small lobe is followed by a broad, slightly convex, margin, bordered on both sides with 

 numerous spinules or setules ; the finger is bulbous at the base, the remainder slender, 

 curved in correspondence with the convexity of the palm-margin, the nail being protected 

 by a projecting cap ; the cap being in this, as in many other similar examples, much more 

 delicate than the naU, has probably some sensitive function. 



Second Gnathopods. — Side-plates similar to those of the preceding segment, but 

 broader above and therefore more squared. The branchial vesicles of delicate texture, 

 an elongate oval attached to a narrow neck. The first joint reaching beyond the side- 

 plate, with setae on both margins ; the second joint scarcely as long as the third, which 

 is roughly quadrate and combines with the triangular wrist to form a cup for the broad 

 hand ; the wrist forms a bent triangle, the lower apex of which is attached to the base 

 of the front margin of the hand as in the genus Eusirus, Kr0yer, while the i)ase adjoins 

 the front margin of the preceding joint, this front margin being, however, no doubt 



