REPORT ON THE AMPHIPODA. 961 



First Mii.riJJ.r. — Inner plate oval, with one plumose seta on, and another a little 

 below, the apex ; outer plate not reaching much beyond the inner, with eleven slender 

 spines on the moderately oblique apical margin, the innermost spine the longest, nearly 

 straight, denticulate, the five following long, curved, with several lateral denticles, except 

 the last, which has only two ; on the inner row of five shorter spines each has two lateral 

 denticles, except the central, which has only one ; the palp reaching considerably beyond 

 the outer plate, the first joint long, more than half the length of the second ; the second 

 joint carrying half-a-dozen seta-like spines on the inner margin near the top, four on the 

 apex, and three at intervals on the hind margin. 



Second Maxilla'. — The inner plate rather broader and very little shorter than the 

 outer ; the outer part of the apex unarmed, the remainder fringed with pectinate spines, 

 of which the series descends the inner margin, closing with two long plumose setae and 

 three quite short simple ones ; the outer plate having the apical and upper part of the 

 inner margin fringed with curved, setiform spines, five short ones descending the outer 

 margin. 



Maxillipeds. — Inner plates not reaching the apex of the first joint of the palp, having 

 three teeth on the apical margin, two close together, a seta intervening between them and 

 the third, which is followed by three or four more setae ; a few setae pass from the inner 

 towards the centre of the apical margin ; the outer plates not very broad, not nearly 

 reaching to the apex of the second joint of the palp, with very numerous spines (not 

 dentiform) along the inner margin, two at the apex longer than the others, and five or 

 six long plumose setae round the upper half of the outer margin ; besides the spines there 

 are on the surface within the inner margin setae as stout as the spines, but longer ; the 

 second joint of the palp is much longer than the first, widening distally, provided with 

 numerous long marginal seta? and a surface row near the apex ; the third joint is longer 

 than the first, crowded with setae and spines of various sizes, many pectinate, some of 

 those adjoining the finger straight, others curved ; the finger a little curved at the tip, 

 its inner edge prior to the tip being set with ten short setae or seta-like spines. 



First Gnathopods. — Side-plates short, bowed out in front, not much longer than 

 broad, with a spine and some spinules on the upper part of the nearly straight hind 

 margin. First joint reaching much beyond the side-plate, fringed in front with long 

 setae which start from the surface, and having two or three tufts on the hind margin ; 

 the second joint short, with an apical tuft behind ; the third oblong, short, with setae on 

 the lower part of the hind margin and the squared apex ; the waist has three rows of 

 setae on the front margin, and seven or eight rows on the curved lobe behind, this lobe 

 giving the wrist, seen from the outside, a cup-shaped appearance, whereas on the inner 

 side it has a lozenge-like shape, the lower and hinder margins of the lozenge carrying 

 setae ; the hand is broader at the base than the wrist, which it greatly exceeds in length 

 and in size generally ; the convex front margin carries several tufts of setae of different 



(ZOOL. CHALL. EXP.— PART LXVII. 1887.) XsX 121 



