328 



the 5th segment is somewhat shorter than the 3rd and 4th segments 

 together; the 6th segment is narrower but distinctly longer than the 5th; 

 the claw is straight, thin, 1/4 to 1/3 the length of the 6th segment, and its 

 anterior margin finely denticulate. Pereopods V and VI are approximately 

 equal in length, pereopods VII somewhat shorter; the 2nd segment is 

 broadened in the distal part, especially so in pair VI; the 5th segment is 

 longer than the 4th (in pairs V and VII) or equal to it (in pair VI); the 

 6th segment is narrower and longer than the 5th; the claws are short and 

 strong; setae, except for small fascicles on the anterior lower angle of 

 the 2nd segment, are absent. The posterior angles of the epimerons are 

 acute and the posterior margin of epimeron III is highly convex. 



Uropods I are longer than uropods II or III, their inner ramus equal 

 to the peduncle and the outer ramus shorter. The rami of uropods II are 

 somewhat longer than the peduncle. Uropods III have a broad peduncle 

 and petaloid rami. The telson is roundish-triangular, its length equal to 

 width in males and less than width in females. 



Distribution: A high Antarctic species, found in the coastal regions 

 of the Antarctic (Oates Coast; McMurdo sound in the Ross Sea) and 

 environs of the South Georgia Islands. 



Absent in our collections. 



268 4. Hyperia spinigera Bovallius, 1889 (Fig. 133) 



Bovallius, 1889: 191; Barnard, 1932: 273 (part, female = H. crassa); 

 Shoemaker, 1945b: 238; Hurley, 1955: 140; Brusca, 1967a: 388; 1967b: 

 452; Bowman, 1973: 20; Thurston, 1977: 502.— antarctia Spandl, 1927: 

 153; Hurley, 1969: 33; Bowman, 1973: 18. 



Length of sexually mature specimens up to 21 mm. 



The body is thickset^. The segments of the mandibular palp are 

 approximately equal in length and the 3rd segment is almost straight. 

 The outer lobes of the maxillipeds are longer than the inner; the setae on 

 the outer and inner lobes are shorter and sparser than in H. medusarum. 



The setae on the distal segments of pereopods I and II are short, 

 much shorter than in other species of Hyperia. The posterior margin of 

 the 4th-6th segments of pereopods III-IV is armed with short thin setae. 

 The 2nd segment of pereopods V-VII is broad. The anterior margin of 

 the 4th and 5th segments of pereopods V is armed with thin short setae. 

 The distal anterior angle of the 2nd segment of pereopods VII beais a 

 fascicle of setae. The posterior margin of epimeron III is convex. The 

 inner rami of uropods II and III are broadly lanceolate. The telson is 

 elongated, its length more than its width at the base. 



Notes: Bovallius (1889) separated this species from H. medusarum 

 on the basis of ornamentation of pereopods I and II, but from H. galba 



Desctiption after Bowman, 1973. 



