248 Miss D. A. Stewart on the Ex Ira- Antarctic 



of the last two ural segments, which has already been dealt 

 with in this paper. 



In the structure of the seventh leg, to which he also drew 

 attention, the ' Discovery ' specimen agrees in having- the 

 last joint shorter than the penultimate one. 



Distribution. The Atlantic, the Mediterranean (Bovallius) ; 

 N. Atlantic Ocean (Chevreu.v) ; Sargasso Sea and tropical 

 Atlantic ( Vosseler) . 



Vibilia serrata, sp. n. (PI. IV. ; PI. V. figs. 1-6.) 



Localities. Lat. 54° 3' S., long. 34° 35' W., Dec. 17th, 

 1903, surface (off St. Georgia), two males. Lat. 36° 27V S., 

 long. 8° 20' W., Sept. 24th, 1901, one male. Lat. obs. 

 37° 47' S., long. 3° 59' E., Sept. 28th, 1901 (near Tristan da 

 Cunha), one male. 



Body (PI. IV.) fairly broad and stoutly built ; pleon sharply 

 distinct from the pereion. 



Head rostrate, about twice as deep as long, and considerably 

 longer than the first two pereional segments. 



Pereion rounded, not carinate ; equal in length to the 

 pleon. 



Epimeral plates of the pleon of considerable size and 

 covering about half the peduncles of the pleopods ; lower 

 margins deeply serrated, the number of teeth being greater 

 on the second and third than on the first plate. 



Eyes extremely large, occupying the entire lateral portions 

 of the head ; deeply pigmented. 



First antennae, (PI. V. fig. 1) having the basal joint of the 

 peduncle longer than the other two together ; the first joint 

 of the flagellum half as long again as the head, broad and 

 oval at the base, and becoming thin and tapering at the apex ; 

 terminal joints two in number and very minute. 



Second atiiennce (PI. V. fig. 2) seven-jointed, of which 

 the fifth is the longest ; the anterior border of all the joints 

 bearing numerous small bristles. 



First ynathopods (PI. V. fig. 3) simple, slightly shorter 

 than the second j basal joint of considerable breadth; merus 

 with a prominent seta at the hinder edge of the lower 

 border ; carpus considerably broader than the propodus, but 

 about the same length, the corners of the distal border 

 feebly produced ; curved inner border of the propodus finely 

 serrated ; dactylus stoutly built and half as long as the 

 propodus, having the inner margin finely serrate. 



Second gnathopods (PI. V. fig. 4) : basal joint long and 

 somewhat linear ; merus having the hinder border fringed 



