0"P THE ' SOTJTHEEN CBOSS ' EXPEDITION. 61 



Fam. IscHTEOCEBiD^, Stelling* 



G-enus Jassa f, Leacli, 1815. 

 (Syn. Podocerus, auctorum.) 



J. GONIAMERA t, 11. Sp. (PI. 11. figS. 98-106 «.) 



Many specimens, Cape Adare, Nov. 10, 14, & 26, 1S99 ; 

 26 fath. 



Body scarcely compressed. First four side-plates small, 

 rounded below ; 5tli smaller than the 4th, obtusely angled below. 

 First segment the shortest, remaining segments subequal. Hind 

 margin of 3rd metasome-segment convex, forming an obtuse angle 

 with the lower margin. 



Head almost as long as the first two segments. Eyes rather 

 large, dark, prominent. 



Upper antennae reaching a little beyond the last joint of the 

 peduncle of the lower, 2nd and 3rd joints subequal, 1st about 

 half as long. Flagellum rather longer than the last joint of the 

 peduncle, 14-joiiited, the 1st joint as long as the next three. 

 Accessory appendage 1-jointed, about one-third the length of 

 the 1st joint of the flagellum. The whole rather sparingly 

 clothed with long setae on the underside. 



Lower antennae : the 1st joint barely half as long as the 2nd ; 

 the 3rd one-third longer than the 2nd. Flagellum shorter than 

 the 3rd joint, the 1st joint as long as the next three ; very 

 sparsely clothed with short setas. 



Dactylus of palp of maxillipedes blunt at the tip, which is 

 clothed with long setae. Other mouth-organs normal. 



First gnathopods as in Jassa falcata (Montagu). 



Second gnathopods : first joint about half as long as the pro- 

 podos. Carpus very short, cup-shaped, not produced behind. 

 Propodos about three times as long as wide ; a strong tooth near 

 the proximal end and another irregular one near the distal end 

 of the posterior margin. Dactylus strong, reaching almost to 

 the proximal tooth. 



First peraeopods : first joint almost as long as the remaining 



* Ann. & Mag. Nat. Hist. ser. 7, vol. iv. 1899, p. 211. 



t See G. O. Sars, 'Amphipoda of Norway,' under Podocerus, p. 693, for 

 definition of genus, except as to 3rd uropods. 



I From yiDvia, angle, firipbs, thigh, alluding to the form of the 1st joint of 

 the last perasopods. 



