1592 THE VOYAGE OF H.M.S. CHALLENGER. 



but the apex linear, spine-like ; the hand longer than in the first pair, longer than the 

 front margin of the wrist, with eight or nine spines on the inner surface, and three or 

 four little spinules adjacent to the hind margin which is smooth and nearly straight; 

 there is here no toothed apex or palmar margin. The finger curved, acute, not half the 

 length of the hand, having above the centre a little spinule on the inner margin. 



First Perseopods. — First joint slender, curved; second joint longer than broad, with 

 one spinule on the hind margin; third longer than fourth, which is only a little wider than 

 the fifth and scarcely shorter ; the finger about a third of the length of the fifth joint ; the 

 third joint has two slender spines on the hind margin, the fourth four, the fifth two. 



Second Perseopods like the first, but with the fifth joint longer, the finger only a 

 fourth of the length of the preceding joint. 



Third Perseopods considerably the longest ; the side-plates with a tongue-shaped 

 process on the inner surface ; the branchial vesicles with a constriction near the narrowed 

 apex ; the first joint not greatly widened, widest at the centre, the hind margin convex, 

 the front almost straight ; the second joint short, with rounded front apex ; the third 

 considerably longer than the fourth and a little longer than the fifth ; the finger about a 

 quarter as long as the fifth joint, slender like the three preceding joints. 



Fourth Perseopods. — First joint as long as in the preceding pair, at the upper part 

 considerably wider, the hinder apex rounded, produced behind the short second joint; the 

 third joint considerably longer than the fourth or fifth, with the front margin and apex 

 strongly pectinate ; the fourth joint shorter than the fifth, both pectinate along the 

 front, but much more delicately than the third joint ; the finger nearly straight, very 

 acute, more than a third of the length of the fifth joint. 



Fifth Perseopods. — Side-plates with rounded angles, partly distinct from the segment. 

 The limb longer, if outstretched, than the first joint of the preceding pair ; the first joint 

 not very widely expanded, longer than the remaining joints together ; of these the third 

 is the longest ; the finger minute, spine-like. 



Pleopods. — The cleft spine with short arms, that with the subapical dilatation the 

 longer ; the joints of the rami six in number. 



Uropods. — Peduncles of the first pair reaching to the base of the telson, rather longer 

 than the rami ; the slightly longer inner ramus reaches as far back as the apex of the 

 outer ramus of the third pair ; the edges of all the rami are pectinate with long decurrent 

 teeth ; the peduncles of the second pair are longer than the outer, shorter than the inner, 

 ramus ; the inner ramus is subequal to those of the first pair ; peduncles of the third 

 pair much longer than broad, shorter than the rami, the inner margin having a little 

 apical tooth ; the outer ramus is shorter and narrower than the inner. 



Telson fully twice as long as the breadth at the base, triangular, with gently convex 

 sides, the produced and sharply pointed apex reaching a little beyond the uropods. 



Length, fully extended, two-fifths of an inch. 



