880 THE VOYAGE OF H.M.S. CHALLENGER. 



outer, its broad oblique distal margin crowded with pectinate spines and having four or 

 five plumose setae along the lower inner part ; there are a few small spines at the distal 

 part 1 of the outer margin; the distal margin of the outer plate carries fifteen long 

 distally pectinate spines, besides several smaller ones, a few of which also are found on 

 the outer margin. 



Maxillipeds. — The inner prismatic plates not reaching so far as the distal end of the 

 first joint of the palp, with very numerous setae on the inner margin, three small spine- 

 teeth and several incurving spines on the distal margin ; the outer plates large and broad, 

 but not reaching the distal end of the second joint of the palp ; the inner margin almost 

 smooth, with a few setadike spines on the surface near them ; the rounded distal border 

 separated from the inner margin by the apical angle of the latter, set round with eight 

 spine-teeth and four seta?, graduating as usual from the one to the other ; first joint of 

 the palp not much shorter than the second, the second much longer than the third ; the 

 finger short, its inner margin armed with six teeth ; the nail sharp. 



First Grnathopods. — Side-plates narrow, triangular, extending a little below the 

 lower angle of the head, channelled at the back, the apex of the hind margin forming the 

 point of the triangle. The first joint reaching beyond the side-plate, bent at the upper 

 part, both margins carrying numerous long setaa, the front margin, much of which is 

 straight, having also many spines, the third joint longer than the second, both with 

 spines at the apex ; the wrist subequal in length to the hand, twice as long as broad, 

 with four large groups of spines on the hinder margin, and one at the apex of the front ; 

 the hand oblong, a little broader at the palm than at the base, with short spines at the 

 apex in front, a group about one-third of the hand's length from that apex, several on the 

 inner surface and hind margin ; the serrate palm is connected by a gentle curve with the 

 hind margin, which is here finely pectinate, some rather stronger spines being inserted 

 on the surface near ; the finger strong, much curved at the slender nail, reaching beyond 

 the palm border, and having its inner edge armed with twelve teeth, or rather spines, 

 since they appear to be inserted in the margin, not to be part of it. 



Second Gnathopods. — Side-plates rather longer than the preceding pair, and a little 

 more squared below. The limb like the preceding, but the joints, especially the hand, a 

 little longer ; many of the spines in both gnathopods pectinate on two edges. 



First Perxojpods. — Side-plates similar to the preceding pair, but longer and broader, 

 the lower edges of the first three side-plates forming a continuous line. First joint of 

 the limb reaching below the side-plate, carrying long setae and short spines on the 

 margins ; second joint short, with spines at the apex before and behind, this and the 

 remaining joints as in the following pair. 



Second Perieopods. — Side-plates with the front margin long and sinuous, ending 

 below in a sharp angle which points backwards, the hind margin excavate about a third 

 of its length,, then with a deep curve joining the front margin at its apex ; the hinder 



