1096 THE VOYAGE OF H.M.S. CHALLENGES. 



the commencement of the oblique palm ; the front margin a little convex, with several 

 groups of spines on or near the distal half, the hind margin nearly straight, carrying 

 some seven large groups of spines, and apically ending in a long narrow tooth, within 

 which is a very small palmar spine ; from this the palm runs in a very oblique but even 

 course towards the hinge of the finger, before reaching which it forms a second tooth-like 

 jn-ocess smaller than the first, by means of the small cavity which precedes the broad 

 irregular process that extends to the hinge ; the margin of this long palm is set with 

 spiuules and some of the groups of spines which are dispersed upon the broad surface 

 of the hand ; there seem to be no strong or broad spines in any part of the limb, the 

 little palrnar spine not constituting an exception ; the finger is very much curved, and 

 when closed does not reach the small palmar spine, but rests against the surface at some 

 distance from it ; its inner margin as in the finger of the first gnathopods. 



In the female the first joint, though tolerably broad, is not abnormally so ; there is 

 only a small acute tooth process at the commencement of the palm, having a palmar spine 

 at its side, followed by another further on ; the second process is wanting, the oblique 

 margin is finely pectinate. The marsupial plates are rather broad and long, with many 

 setae. 



First Perasop>ods. — The side-plates with the lower margin convex. The first joint 

 rather long, narrow only at the neck, with gland-cells down each side, some moderately 

 long setse and some spinules on the margins ; the second joint rather longer than broad, 

 with a spine or two at the hinder apex ; the third joint much longer than the fourth, 

 widening distally, with small groups of spines at three points of the straight hind 

 margin, and at the apex and one other point of the slightly convex front margin ; the 

 fourth joint with spines at three points behind and the apex in front ; the fifth joint 

 nearly as long as the third, with spines at five points behind and two in front ; the finger 

 slender, curved, more than half the length of the fifth joint, with an opening on the inner 

 side of the tip for the excretion from the gland. 



Second Perseopods almost the same as the preceding pair. 



Third Perseopods. — -The side-plates broad, with the front lobe very deep, the hinder 

 quite small. The limb missing in the large specimen, in the smaller resembling in struc- 

 ture the following pairs, but notably shorter. 



Fourth Perseopods. — Side-plates very small, scarcely bilobed. The first joint of the 

 limb not greatly dilated, wider above than below, with some small spines along the 

 slightly convex front margin, the hind margin nearly smooth, with a few setules,- the 

 convexity chiefly at the upper part ; the second joint with some small apical spines in 

 front ; the third joint much longer than the fourth, with spines at three points on each 

 margin, those behind in general stronger than those in front ; the fourth joint widening 

 like the third distally, with a group of spines at each apex ; the fifth joint longer than 

 the third, with spines at five points of the front margin and three of the hinder ; the 



