REPORT ON THE AMPHIPODA. 1221 



of which the gland-cone is minute ; the third joint a little bent, widest at the base, 

 longer than the two preceding united ; the fourth joint narrower than the third, which 

 it equals in length, somewhat bent ; the fifth joint shorter than the fourth ; the 

 flagellum tapering, of four or five joints, successively shorter, all of them together not 

 equal to the last two joints of the peduncle. 



Mandibles. — The trunk somewhat curved, narrowing to the distal end, at which the 

 palp is attached, and apparently not fitted to serve any other purpose than that of 

 holding the muscles which move the palp ; first joint of the palp very short, second long, 

 unarmed, third more than half the length of the second, with five setiform spines on the 

 distal part and apex of the inner margin. 



First Maxillae. — The outer plate carrying on the oblique apical margin five very 

 short spines or spine-teeth, serrate on the inner edge ; the palp far outreaching the outer 

 plate, its first joint as broad as long, more than half the length of the second joint, which 

 has two little spines on the broad slightly indented apical border. 



Second Maxilla;. — The inner plate shorter and narrower than the outer, with four 

 setae on the rounded apex ; the outer plate similar in form to the inner, with twice as 

 many setae or spines on or near the apical margin. 



Maxillipeds. — The inner plates reaching about to the middle of the first joint of the 

 palp, the apical margin sloping outward, carrying two little spines ; the outer plates 

 reaching about to the end of the first joint of the palp, with four setules or spinules on 

 the inner and apical margins ; the first joint of the palp rather elongate yet less so than 

 any of the three following joints, which are subequal in length, but the third rather 

 longer than the second or the narrow tapering fourth; two or three apical setules 

 constitute the whole armature of the palp. 



First Gnathopods. — Side-plates deep, the anterior margin an arc of a circle with the 

 hind margin for its chord. The first joint attached rather above the centre of the hind 

 margin of the side-plate, not reaching the lower border, its margins nearly parallel, 

 unarmed ; the second joint more than half the length of the first, as long as the wrist ; 

 the third joint shorter than the second, its hind margin much longer than the front, 

 ending in a pointed apex closely adpressed to- the wrist ; the wrist a little longer than 

 the hand, its front margin longer than the parallel hinder one; the hand narrow, tapering, 

 with two or three tiny setules on the distal part of the hind margin ; the finger very 

 small, a little curved, having in a serration of the hind margin a feathered setule as long 

 as the finger itself, standing out at an angle from it, and followed by a much smaller 

 setule in another serration. 



Second Gnathopods. — Side-plates a little longer and rather less broad than the 

 preceding pair. The first joint attached as in the first gnathopods, but longer than in 

 those, about reaching the lower border of the side-plates, the lower half wider than the 

 upper; the second joint more than half as long as the first, not quite so long as the 



