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



Third Perwopods. — Side-plates subequal in breadth and depth, large, the front lobe 

 descending a little below the hinder one. The first joint smaller than the side-plate, 

 rounded ; on the lower part of the front margin setae at three points, the lowest 

 accompanied by an apical spine, the hind margin smoothly rounded but for two or 

 three minute cilia near the top ; two or three spinules on the front of the second joint ; 

 third joint much expanded, and decurrent on both sides of the fourth joint, four spines at 

 four points in front, and at three behind, the two uj)per ones behind being minute ; a group 

 of three sj^ines on the front apex of the short fourth joint ; the fifth joint much longer than 

 the fourth, with one spine at the centre, two at the hinge of the finger ; finger more than 

 half the length of the hand, with a curved nail ; the front margin of the fourth and fifth 

 joints is fringed with rows of minute spinules or prickles. 



Fourth Perseopods. — Side-plates squarish, hind margin longer than the front. First 

 joint a little larger than the side-plate, rounded, the lower part of the front margin with 

 setae at three or four points, followed by aji apical spine, four cilia on the upper half of 

 the hind margin ; the other joints much as in the preceding pair, but with the fringing 

 spinules much larger on the fourth joint, and less continuous on the fifth. 



Fifth Perieopods. — Hind margin of the side-plates much longer than the front. First 

 joint larger than in the preceding pair, front margin nearly straight, with several cilia 

 along the lower part, the hind margin with two cilium-bearing indents at the lower end ; 

 the surface, as in the corresponding joint of the two preceding pairs, is downy ; the third 

 joint is less expanded but equally decurrent, with a spine on the inner side of the 

 decurrent part ; the fifth joint, pectinate on both margins, has a cilium at the centre of 

 the hinder margin. 



Pleopods. — Peduncles short, coupling spines two, with three or four retroverted 

 teeth on one edge and two on the other ; cleft spines on the inner ramus two to three, 

 the two divisions of the cleft part of equal length ; the joints of the inner rami from five 

 to six, of the outer from seven to eight in number. 



Uropods. — Peduncles of the first pair equal in length to the longer ramus ; the rami 

 stiliform, the lower the longer, each with a spine on the margin at some distance from 

 the apex ; the second pair much shorter than the first, peduncles as long as the lower 

 longer ramus, the rami finely pectinate ; the third pair very short, with a tubercular 

 ramus. 



Telson extending beyond the third uropods, short, narrowing distally, with an 

 emargination of about a quarter of its length, rather deeper than wide, the apices tipped 

 with spines. 



Length of the specimen in the position figirred, from the front of the head to the 

 end of the third pleon-segment, three-twentieths of an inch. 



Locality. — Station 149d, Royal Sound, Kerguelen, January 20, 1874; depth, 28 

 fathoms ; bottom, volcanic mud. One specimen. Dredged. 



