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



not reaching halfway up the second joint, the inner margin ending in a small apical 

 tooth, on the outer side of which, not projecting beyond it, is a small spine-tooth, and 

 beyond this at the outer corner a slender seta ; the large second joint is produced into a 

 small almost conical plate about halfway along the first joint of the palp, with a spine at 

 its apex, and a series of six or seven smaller spines along the inner margin of the joint ; 

 the first three joints of the palp are together but little longer than this joint ; the first is 

 rather longer than the second, and equal in length to the third ; the spines on these 

 joints are few ; the finger is nearly as long as the third joint, broad at the base and narrow 

 towards the end, with the inner margin pectinate like the corresponding finger in 

 Stenothoe adhserens. 



First Gnathopods. — Side-plates very small, convex in front, not quite concealed by 

 the following pair. First joint attached at the lower end of the side-plate, not quite so 

 long as the third, fourth, and fifth joints united, with two setse about the middle of the 

 front margin, and some apical cilia on the hind margin ; the second joint short ; the 

 third as long as the wrist, with no free front margin, the hinder furred, the apex 

 carrying a group of spines, of which one is much more conspicuous than the rest in size 

 and pectination ; the wrist is much shorter than the hand, distally squared, rather 

 cup-Hke, with a spine on the hind margin like that at the apex of the preceding joint, 

 besides two or three others not showing the same pectination ; the hand is long and 

 narrow, with a bend near the base of the front margin, which below the bend carries four 

 spines and some apical setse; the shorter hind margin is nearly straight, the proximal half 

 naked, below which are four setse, at the fourth of which begins a series of palmar spines, 

 a single one followed by two pairs ; the finger closing over the very oblique convex palm 

 reaches with its tip the base of the second pair of spines ; the palm shows very fine 

 pectination, and is bordered by a few submarginal setse and setules. 



Second Gnathojyols. — Side-plates more than twice as long as broad, the hind margin 

 nearly straight, with some small spines in the serrations of the lower end, the front margin 

 meeting the hinder with a continuous curve. Branchial vesicles so short and narrow 

 as to seem rudimentary, unless accidentally aborted in the present specimen. The 

 marsupial plates narrow, with ten or twelve setse around the distal part. The first joint 

 of the limb not reaching the end of the side-plate, equal in length to the third, fourth, and 

 fifth joints together, with several setae at the lower end of the front margin ; the second 

 joint with a small apical group of spines on the hind margin ; the third joint shorter 

 than the wrist, with a group of spines at the apex of the hind margin, and one spine 

 higher up ; the wrist much shorter than the hand, distally cup-like though narrow, both 

 margins convex, the hind part produced beyond the front, furred, with an apical group 

 of spines ; the hand three times as long as broad, almost parallel-sided, a little widened 

 at the palm, which is defined by one pair of spines, and along its margin has a second 

 pair, together with a seta and some setules, all submarginal at their origin, the actual 



