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



Second Maxillae. — The inner plate shorter and decidedly narrower than the outer, 

 with two plumose setae, one on the surface near the distal part of the inner margin, the 

 other further from the inner and nearer the distal margin ; on the distal margin there are 

 six or seven spines, and rather more than that number on the outer plate, with the usual 

 gradations. 



Maxillipeds. — (These in dissection came away adhering to the first gnathopods.) The 

 inner plates not reaching as far as the distal end of the short first joint of the palp, with 

 a few plumose setae on the inner margin, three small teeth and some slender curved 

 spines on the truncate distal margin ; the outer plates small, scarcely reaching beyond 

 the middle of the second joint of the palp, the inner margin smooth, with a few sub- 

 marginal spines on the outer surface near it, and four on the distal part of the inner 

 surface ; there are three curved spines in notches of the distal margin ; second joint of 

 the palp widening a little distally, not twice the length of the first, with a few slender 

 spines on and near the front margin ; the third joint rather longer than the first, 

 produced in a short pointed ciliated cap over the base of the finger, the distal margin 

 surrounded with spines ; one spine near the middle of the hind margin ; the finger 

 small and slender, its inner margin sinuous, with a couple of cilia near the sharp spine- 

 like nail ; the dorsal cilium long, set not very close to the base of the finger. 



First Gnathopods. — Side-plates short, oblong, but wider below than above, outdrawn 

 at the lower front corner in a rounded angle. First joint of the limb reaching much 

 below the side-plate, its margins almost naked ; second joint short ; third forming a sharp 

 triangular tooth at the hinder apex, with a few pectinate spines near it, the front apex 

 which rests on the wrist being also sharp ; the wrist shorter than the first joint, equal in 

 length to the hand, the front margin almost unarmed, the hinder armed at four points 

 with pectinate spines ; the hand a little widened distally, the front margin convex, longer 

 than the hinder, carrying a few long setiform spines ; the hinder margin straight, with a 

 group of pectinate spines at the centre, and another at the apex, including a stout 

 pectinate spine ; the palm short, convex, quite distinct from the hind margin, yet not 

 sharply defined, armed with a few setules, and having one that is plumose adjoining the 

 hinge of the finger ; the finger reaching with the nail beyond the palm, having a small 

 decurrent tooth about the centre of its inner margin, and a few cilia near the nail ; the 

 dorsal cilium near the base, very small. 



Second Gnathopods. — Side-plates small, oblong, both the lower corners rounded. 

 The branchial vesicles as long as the side-plates, oval, flask-shaped. The first three joints 

 of the limb as in the preceding pair, but longer ; the wrist distally broader than in the 

 preceding pair, not so long as the hand ; the hand similar to that of the first gnathopods, 

 but considerably longer and broader ; the finger thicker. 



First Peneopods. — Side-plates and branchial vesicles a little larger than in the 

 preceding segment. First joint of the limb reaching much below the side-plate, broader 



