1290 THE VOYAGE OF H.M.S. CHALLENGER. 



and slightly longer, bent at the base ; the fifth joint not as long as the preceding two 

 together, but much longer than either, its front margin straight, and like the hinder 

 minutely pectinate ; the finger a little longer than the fourth joint, constricted just below 

 the base, thence widening and from the middle again narrowing to a blunt apex, the 

 armature of the margins being exceedingly minute. The whole limb is about two-thirds 

 the length of the fourth perseopod. 



Pleopods. — Coupling spines exceedingly minute ; cleft spine stout, with the arms 

 slender, unecmal in length ; the joints of the rami eight in number, the outer ramus 

 narrower than the inner. 



Uropods. — The peduncles of the first pair scarcely so long as the rami ; the rami equal, 

 lanceolate, reaching just beyond those of the third pair, each cut into five or six sharp 

 teeth on the inner margin and nine or ten on the outer, the apex long, acute ; the 

 peduncles of the second pair reach as far as those of the first, the rami are as long as the 

 peduncles ; the inner ramus has the inner margin nearly smooth, the outer pectinate ; the 

 outer ramus is a little longer and has its outer margin cut into six teeth, the inner with 

 the upper part pectinate, the lower part cut into three teeth, the apex long, acute ; the 

 peduncles of the third pair, which are set apart, reach much beyond those of the other 

 two pairs, and are a good deal longer than the rami ; the outer ramus has its outer 

 margin smooth, the inner pectinate ; the inner ramus the reverse ; ventrally the distal 

 margin in the various peduncles is pectinate. 



Telson rather longer than broad, triangular, with a well-rounded apex, reaching more 

 than half-way down the peduncles of the third uropods. 



Length.— The specimen, in the position figured, measured one-fifth of an inch in a 

 straight line from the apex of the upper antennae to the back of the third pleon-segment. 



Locality. — "March 9, 10, 1874, surface. South of Australia"; lat. 48° 18' S., long. 

 130° 4' E. Three specimens. 



Remarks. — The specific name refers to the southern latitude from which the specimens 

 were obtained. The species agrees with Vibilia gracilis, Bovallius, from the Pacific, in 

 having a rostrum and in having a tapering flagellum to the upper antennae, but here the 

 carpal process of the second gnathopods is strongly instead of " sparingly " serrated, and 

 the telson is not round but triangular. 



Vibilia antarctica, n. sp. (PI. CL.). 



Frontal margin of the head shallowly convex ; back of the animal broadly rounded, 

 the first two segments of the perseon together shorter than th.e head ; none of the 

 segments either of the perseon or the pleon very long, the terminal part of the pleon 

 having an unusually stumpy appearance. 



