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



the front margin, and five in the notches of the hind margin ; the third joint two and 

 a half times the length of the first, with many spines along the margins, two on the 

 slightly concave front margin being long like those at the apex ; the fourth joint 

 rather shorter, the fifth much longer than the third, both very slender and carrying- 

 numerous spines on both margins ; the finger missing. 



Fifth Permopods. — The side-plates as broad as those of the third perseopods, the lower 

 margin somewhat lobed in front. The branchial vesicles very small. The first joint of 

 the limb much larger than in the preceding pair, with several small spines on the nearly 

 straight front margin, and nine small ones in the serrations of the convex hind margin ; 

 the third joint longer and stouter than that of the fourth perseopods, similar in shape, 

 carrying many spines, its length double of the first joint. The remainder of the limb 

 missing. 



Pleopods. — Coupling spines small, with a single lateral retro verted tooth close to the 

 apex ; cleft spines six on the first pair, five on the second, three on the third pair, the arms 

 long and very unequal ; above the cleft spines are several plumose setae ; joints of the 

 rami sixteen and nineteen in the first pair, eighteen and twenty-two in the two other 

 pairs, the smaller number belonging to the inner ramus. 



Uropods. — The peduncles of the first pair rather longer than the rami, with small 

 spines along the margins ; the rami slender, acute, nearly equal, the outer a little the 

 shorter, both with a few marginal spines ; the peduncles of the second pair longer than 

 the outer, shorter than the inner ramus, with spines on the outer margin and at the acute 

 apex of the inner ; the rami have few marginal spines ; the peduncles of the third pair 

 much shorter than the rami, reaching back a little beyond those of the two preceding- 

 pairs, having some spines on both margins, those on the inner very slender, except one 

 that lies beside the very acute apex ; the rami broad and long, nearly equal, the outer 

 rather shorter than the inner, both with numerous marginal spines, and both narrowing 

 rather abruptly to the acute apex. 



TJie Telson long and narrow, reaching nearly to the apices of the rami of the third 

 uropods ; the greatest breadth not one-third of the length, the sides converging very 

 slightly till near the apex, which is almost acute, although divided by a very short 

 slightly dehiscent slit ; the surface carries many spinules at a little distance from the 

 lateral margins, and near the top of each of these margins a long feathered cilium 

 or seta with a short spine beside it ; the margins show some pectination especially near 

 the apex. 



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

 rostrum to the apex of the third uropods, nine-twentieths of an inch. 



Locality. — Two specimens were obtained at Kerguelen ; depth not specified. 



Remarks. — The specific name refers to the place of capture. 



