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



long accessory thread and a seta, two short straight spines adjoining the hinge of the 

 finger on the inner side ; the finger short, little curved, with a small nail, the dorsal 

 feathered cilium near the hinge. 



Second Perwopods. — Side-plates of considerable breadth below. The joints of the 

 limb scarcely distinguishable from those of the preceding pair. 



Third Perseopods. — Side-plates a little outdrawn below in front, length and breadth 

 subequal ; first joint elongate but not narrow, broader above than below, the rounded 

 lower margin behind descending below the second joint, front margin spined, with a few 

 setae, the hinder margin not strongly serrate ; the third joint expanded, hinder angle 

 outdrawn downwards ; fourth joint narrower, perhaps a little longer ; fifth joint narrower 

 and a little longer than the fourth ; finger short, curved. 



Fourth Perwopods. — First joint similar to that of the preceding pair but larger, not 

 drawn out below the second joint ; the third joint much longer than in the preceding 

 pair, and less expanded in proportion to its breadth; the fourth joint longer than the third 

 or the fifth, which are subequal ; finger short, but longer than that of the preceding pair ; 

 the whole limb considerably longer than the pair preceding or the pair following. 



Fifth Perspojiods. — The first joint longer and much broader than in the j)receding 

 pairs, the third joint shorter and less expanded, the fourth equal in length to that in the 

 third pair, but narrower ; the fifth joint and the finger rather longer than those in the 

 third pair. In these three pairs of limbs the armature is similar ; on the hind borders 

 of the third, fourth and fifth joints some small spines, with larger ones apically ; setae 

 and spines on the front margins of all the earlier joints, spines only on the fifth ; a rather 

 large group of spines on the front apex of the fourth joint. 



Pleopods. — The coupling spines on the peduncles exhibit a row of three marginal 

 retroverted teeth ; the joints of the rami number from fifteen to seventeen ; the cleft 

 spines form a series of four in the first pair and the second, of three in the third pair. 



Uropods. — Peduncles of the first pair longer than the rami, rami stiliform, a little 

 curved at the tips, with four or five marginal spines ; peduncles of the second pair equal 

 in length to the rami, the rami equal ; the peduncles of the third pair subequal in length 

 to the inner ramus ; the rami short, broadly lanceolate, the outer exceeding the length 

 of the inner by nearly the length of its nail, the inner having no nail or only a rudiment, 



Telson extending beyond the peduncles of the third uropods, cleft for more than 

 two-thirds of its length, widening from the base to a level with the top of the cleft, then 

 narrowing with convex outer margin to the apices, which are more outdrawn on the outer 

 than the inner edges, between the two angles each containing a strong spine with 

 accessory thread ; on each side is a small spine nearly on a level with the top of the 

 cleft, and lower down a larger one. 



Length of the specimen, in the position figured, about seven-twentieths of an 

 inch. 



