KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. NIO 7. 243 



Colour. Red, with spöts af dark brown. 



Length. 6—8 mm. 



Hab. The American Antarctic region: Lat. 58° 43', Long. 76° W. (D. M.; F. M.; K. M.; P. M.; 

 S. M.; U. M.) 



Syn. 1887. Hyperidla antarctica, C. BOVALLIUS. 



— "Systeraatioal list of the Amphi- 



poda Hyperiidea». Bih. t. K. 

 Sv. Vet. Ak. Handl. Bd. 11. 

 N:o 16, p. 20. 

 : — 1887 . »Arctic and Antarctic Hyperids». 



Vega-Exp. Vetensk. Iakttagel- 

 ser. Bd 4, p. 566, pl. 45, 

 fig. 72—80. 

 Th. Stebbing. 1888. »Report on the Amphipoda». 

 Voy. of H. M. S. Challenger. 

 Zoology. Vol. 29, p. 1407. 



Hyperiella antarctica is distinguished from H. dilatata by the greater length 

 of the fifth pair of perseopoda, the unarmed lateral parts of the pleonal segments, and 

 by the ovate or elongate-ovate form of the inner rami of the last two pairs of uropoda. 

 The feraale has the forepart of the body wider, and the hind part comparatively shorter, 

 than the male, but the perseon is not more than twice as broad as the pleon, as it is in 

 Hyperiella dilatata. 



The male. 



Pl. XI, %. 42—51. 



The bodi/ is strongly built; the integiiment is tolerably thick and härd. The head 

 and pera3on together are a little longer than the pleon and urus together. 



The head is very large, flat, almost truncated in front; the antennal groove com- 

 mences a little above the middle. The head is considerably deeper than the pen^on, 

 and has the under side evenly rounded. 



The eyes occupy almost the whole surface of the head. 



The Jirst pafr of antenno! (Pl. XI, fig. 42) are shorter than in the genus Hyperia; 

 the reach scarcely to the hind margin of the fourth perteonal segment. The first joint 

 of the peduncle is broader than long, and about as long as the two foUowing joints to- 

 gether; the second joint is only a little longer than the third. The first joint of the 

 flagellum is twice as long as the whole peduncle, wider at the base, with bulging sides, 

 tapering towards the apex, and densely set with long olfactory hairs on the inner and under 

 sides; the second joint is shorter than broad; the third is longer, and about as long as 

 broad ; the third joint is longer than the two preceding together, the fourth and following 



