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



Lower Li]). — Forward lobes strongly furred on the inner margins, their outer margins 

 and the mandibular processes uuciliated. 



First MaxiUie. — The inner plate rather small, with two plumose setae of unequal 

 size at the apex ; the outer plate large, the innermost of the apical spines standing out 

 a little apart from the other six strong ones, these and the four more slender ones a 

 little below all strongly dentate ; the palp with seven small teeth and a ciliated spine on 

 its truncate apex, the teeth in one of the pair of maxillse appearing to be longer than 

 those in the other. 



Second Maxillie. — The inner plate not much shorter than the outer, with six spines 

 on the apex, three on the inner border, and a plumose seta, the border below this seta 

 being, in common with the surface of the plate, very finely ciliated (not coarsely as in 

 the figure mx, 2, ^ ) ; several curved pectinate spines on the apex of the outer plate, 

 one rising from the inner margin just below the apex. 



Maxillipeds. — Inner plates reaching as far as the apex of the first joint of the palp, 

 with plumose setse on the inner margin, on the apical margin three teeth, followed by 

 two curved pectinate spines, the shorter outermost ; the outer plates reaching beyond the 

 second joint of the palp, with eight small teeth on the inner margin, not adjoining but 

 spaced, and a single less-embedded tooth on the apical margin ; second joint of palp 

 scarcely longer than first ; fourth joint with a slender nail, a dorsal cilium near the centre, 

 and a cilium on the inner margin near the nail. 



First GnatJi02Mds. — Side-plates triangular at the base, then oblong, with a slightly 

 curved lower margin ; the first joint longer than all the rest of the limb, a little 

 expanded in the lower half; the third joint scarcely longer than the second, furred 

 behind, with some spines near the apex ; wrist long, furred behind ; hand subequal in 

 length to the wrist, nearly parallel-sided, much longer than broad ; palm slightly concave 

 and oblique, defined by two long spines ; finger not longer than palm, with a dorsal 

 cilium, and one or two cilia near the tooth on the inner margin. 



Second Gnathopods. — Side-plates long. Branchial vesicle with a narrow lobe 

 below. First joint slightly expanded and scarcely bent below, not reaching to the end 

 of the side-plate, and not as long as the third, fourth and fifth joints united ; second 

 joint subequal in length to the wrist ; third joint shorter, flask-shaped, furred behind, 

 two short setse near the rounded apex ; wrist flask-sha23ed, lightly furred on the front 

 margin, the side, and the breast, which has also the microscopic fan-shaped scales 

 common in this family ; the hand subequal to the third joint, narrow at the neck, 

 then expanding, the hinder margin outdrawn so that the palm slopes inward with the 

 minute finger resting close upon it, the anterior part of the apical margin occupied 

 by a small number of the usual spines ; on difi"erent parts of the hand there are cilia 

 longer than those composing the fur ; the finger is set back from the front margin of 

 the hand, with the outdrawn hinder portion of which it forms a minute chela ; it is 



