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



distally, much furred with scales, the hinder part produced beyond the front for the full 

 length of the tiny finger ; the apex of the front margin is occupied by a group of 

 short pectinate spines or setae, beyond which the finger is set and almost lost when closed 

 in its close contact with the projecting part of the hand already mentioned. 



First Peraeopods. — The side-plates with straight hind margin, otherwise similar to 

 those of the preceding segment, but broader and longer. The first joint attached lower 

 down than in the two preceding pairs, very broad, not nearly reaching the end of the side- 

 plate, carrying one group of setaj at the apex of the convex hinder margin ; second joint 

 subequal in length to the fourth ; third joint as broad as the first, and not very much 

 shorter, with setse along the hind margin, and at the apex in front ; fourth joint only 

 half as broad, similarly armed ; fifth joint much longer than fourth, but shorter than 

 third, with seven spines along the hinder margin, that at the hinge of the finger being 

 the largest, and having a smaller one in its company ; the finger stout, with sti'ongly 

 curved nail, together about half the length of the fifth joint. 



Second Perwopods. — Side-plates not very much longer or broader than those of 

 preceding segment, excavation behind not wide but carried far down, the hind margin 

 below it being directed slightly forwards, so that the plate is scarcely broader below than 

 at the base. The first joint reaching little below the excavation, the second decidedly 

 longer than the fourth, and with several setse on the hind margin ; the third joint of 

 tolerably even width throughout, not greatly expanded below the base as in the 

 preceding pair, which this in general resembles. 



Third Perseopods. — The side-plates rather wider than deep, the front margin more 

 convex than the hinder. The first joint broadly oval, with numerous setaj on the front 

 margin, the hinder very shallowly crenulate, with small cilia in the pits ; the second 

 joint overlapped behind by the first, many setse and half a dozen spines along its front 

 border ; the third joint greatly expanded and decurrent, with some twenty spines and a 

 few setse distributed on the front margin and apex ; the hinder expansion is rhomboidal, 

 the lower edge descending below the fourth joint, the hinder margin being serrate, and 

 the apex carrying a spine ; the small fourth joint has spines in front at two points on the 

 margin and a group at the apex ; the fifth joint is smaller than in the preceding pair, with 

 spines at five points of the front margin ; the finger like that of the preceding pair, with 

 the dorsal cilium small, very near the base. A slender accessory vesicle belongs, I think, 

 to the branchiae of this pair. 



Fourth Perseopods. — Side-plates with straight, almost parallel sides, the hinder 

 lobe produced below the front one. The branchial vesicle small, descending little 

 below the side-plate. The first joint larger than the side-plate, broader than deep, 

 rounded, larger than the first joint of the preceding pair, the third joint also larger, but 

 the general structure and armature of the limb similar. 



Fifth Perieopods. — Side-plates with the hind margin nearly straight, much longer 



