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



higher up ; the fiDger as in the preceding pair. In the specimen examined, the 

 first joint of one limb of this pair was only half the size of the first joint of its 

 fellow. 



Fourth Perxopods. — Side-plates with a long decurrent hind lobe. Branchial 

 vesicles narrow above and below, reaching a little beyond the side -plates. First joint of 

 the limb resembling that of the preceding pair in shape, but exceeding it in size; the 

 rest of the limb also similar to the preceding but longer. 



Fifth Perseopods. — Side-plate small, rounded behind. First joint of the limb not 

 longer, but broader, than that of the preceding pair, the expansion behind being longer 

 than the front part of the joint ; the rest of the limb very similar to the preceding 

 pair. 



Pleopods. — Coupling spines small, the base widened, three lateral retroverted teeth 

 immediately below the apical; cleft spines three to four, with very unequal arms; joints 

 of the rami numbering from nine on the inner to twelve on the outer. 



Uropods. — Peduncles of the first pair reaching a little beyond those of the second, 

 rather longer than the inner ramus, apically a little produced on the inner side, with a 

 large curved spine issuing from the apex ; the outer ramus shorter than the inner, with 

 three or four spines on the inner margin, and a group, of which one is stout, on the blunt 

 apex ; the inner ramus similarly armed ; peduncles of the second pair longer than the 

 outer, shorter than the inner, ramus ; the rami armed as in the preceding pair ; 

 peduncles of the third pair shorter than the rami, which are broad, lanceolate, equal in 

 length, or the outer slightly the shorter, nearly as long as the inner ramus of the first 

 pair, with three or four small spines on each margin. 



Telson longer than the peduncles of the third uropods, reaching just as far back, its 

 breadth at the base contained once and a half in its length, the sides converging so that 

 the distal end is half the width of the broadest part ; a small triangular emargination is 

 flanked on either side by an apex incised for the insertion of a spine ; the place of 

 insertion of a cilium was indicated on each margin a little above the apex, but the cilia 

 were not present. 



Length. — The specimen, in the position figured, measured, exclusively of the antennae, 

 a quarter of an inch. 



Locality. — Kerguelen. Two specimens ; the one examined and described was a 

 female. 



Station 149h, off Cumberland Bay, Kerguelen, January 29, 1874; depth, 127 fathoms; 

 bottom, volcanic mud. One specimen. Dredged. 



Remark. — The specific name, derived from the Greek words Speiravov, a sickle, and 

 Xeip, the hand, alludes to the peculiar sickle-shaped hands of the two gnathopods. 



