KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 243 



Colour. Red, with spots 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.) 



Syil. 1887. Hyperiella dntarctica, C. BOVALLIUS. 



"Systematical 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, pi. 45, 

 fig. 72—80. 

 Th. Stebbing. 1888. "Report on the Araphipoda». 



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 peraeopoda, 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 female has the forepart of the body wider, and the hind part comparatively shorter, 

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

 Hyperiella dilatata. 



The male. 



PI. XI, fig. 42—51. 



The body is strongly built; the integument is tolerably thick and hard. The head 

 and peraeon 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 peraeon, 

 and has the under side evenly rounded. 



The eyes occupy almost the Avhole surface of the head. 



The first pair of antenna? (PI. XI, fig. 42) are shorter than in the genus Hyperia; 

 the reach scarcely to the hind margin of the fourth peraeonal segment. The tirst joint 

 of the peduncle is broader than long, and about as long as the two following 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 w r ith 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 



