1080 THE VOYAGE OF H.M.S. CHALLENGER. 



having consequently a rather longer palm, which at the same time is more oblique ; 

 over this the finger closes, bending down beyond the palmar spine and approaching but 

 not reaching the margin beyond it. 



Second Gnathopods. — The branchial vesicles narrow, much longer than broad, shorter 

 and narrower than the first joint. The first joint has many slender marginal spines, two 

 longer than the rest near the top of the hind margin ; on the wrist and hand near the 

 front margin the spines are longer, more numerous, and more setiform than in the other 

 species, the hand is more slender and the palm more oblique, the finger more curved, 

 with its nail not projecting, but passing the base of the palmar spine and resting within 

 the hind margin. 



First Perseopods.— Branchial vesicles rather wider than in the preceding segment. 

 The first joint not longer than the third and fourtb united, the front margin straight, 

 with spinules at intervals, the hind margin carrying some slender spines, and one 

 longer than the rest near the top ; the third joint quite as long as the fifth and scarcely 

 longer than the fourth ; the fourth joint having near the top of the front margin a 

 very small spine, below this in succession a longer one, two small groups, a spinule, and 

 a group of several slender spines ; the fifth joint has on the upper half of the hind 

 margin four slender spines, graduated in length, the longest lowest. 



Fourth Perseopods. — The third joint with slender spines at two points of each 

 margin, and a spinule at two other points of each margin ; the fourth joint with very 

 small slender spines at two points and hairs at two points of the front margin, with a 

 large group of long slender spines at the apex, at the apex behind there is a group of 

 three short bent spines and some that are setiform ; the fifth joint has some small 

 spines at six points of the front margin, a large group of setiform spines at the apex 

 behind, and higher up one or two spines and one or two spinules ; the naU is less than 

 half the length of the fifth joint. 



Fifth Perseopods. — The margins of the first joint not serrate nor carrying stout- 

 little spines as in the other species, but in both male and female almost absolutely 

 smooth except for a few little setules ; the third joint subequal in length to the fifth ; the 

 nail much less than half the length of the fifth joint. 



Pleopods. — One of the rami examined had only two cleft spines ; the joints 

 numbered from eleven to twelve. 



Uropods. — In none of the pairs are the peduncles longer than the rami ; the outer 

 ramus of the third pair has, besides the two small spines and the cap, three more 

 slender spines apically feathered ; that these are not represented in either specimen of 

 the other species, may, however, be accidental. 



The Telson longer than its breadth. 



Length. — The female specimen, in the position figured, measured, in a straight line 

 from the front of the head to the extremity of the uropods, three-tenths of an inch 



