336 



length of the 6th segment and bears many short setae in the proximal part 

 of the inner margin. Pereopods V are distinctly longer than all the other 

 pairs, equal in length to the head, the pereon, and somite I of the pleon 

 together; the 4th segment is distally broadened and 1/3 longer than the 

 3rd; the 5th segment is twice longer than the 4th, just barely shorter than 

 the 2nd, its anterior margin straight, and the posterior margin slightly 

 convex; the 6th segment is almost straight, much narrower than the 5th, 

 and distinctly longer than it; the strong claw is 1/4 the length of the 6th 

 segment; the anterior margin of the 6th segment and proximal part of the 

 anterior margin of the claw are armed with thin short setae. Pereopods VI 

 and VII are 1/3 shorter than pereopods V and just slightly shorter than 

 pereopods III and IV; the 2nd segment is the same shape as in pair V; 

 the 5th segment is the same width as the 4th and barely longer than it; 

 the 6th segment is only slightly narrower and slightly longer than the 

 5th; the claw is less than 1/3 the length of the 6th segment. 



The somites of the pleon have a broadly rounded posterior lower 

 angle. The basipodite of uropods I is somewhat longer than the 

 lanceolate endopodite and the exopodite is shorter and narrower than 

 the endopodite. The basipodite of uropods II broadens distally and is 

 almost equal in length to the broadly lanceolate endopodite; the exopodite 

 is much narrower and somewhat shorter than the endopodite. The 

 basipodite of uropods III is broader and longer than in uropods I and 

 II and twice longer than the broadly oval endopodite; the exopodite 

 275 is almost twice narrower than the endopodite but just barely shorter. 

 The triangular-galeiform telson has an acute apex, is distincdy shorter 

 than urosomite III, and less than 1/3 the length of the basipodite of 

 uropods III. 



Distribution: A circum-Antarctic species. It is found from the north- 

 ern border of the pack ice to the Antarctic Convergence, but at places 

 goes farther north, right up to the Subtropical Convergence. 



2. Hyperiella dilatata Stebbing, 1888 (Fig. 138) 



Stebbing, 1888: 1403; Bovallius, 1889: 247; Spandl, 1927: 162; 

 Barnard, 1932: 274; Hurley, 1969: 33; Bowman, 1973: 27. 



Length of adult specimens 6-8 mm. 



This species is very close to the preceding one and is distinguished 

 from it only by some structural details. 



The head is less in length than the first three somites of the 

 pereon together. Pereopods V are shorter than the head and pereon 

 together. The anterior distal angle of the 2nd and 4th segments of 

 pereopods V-VII is stretched into a small acute denticle. The 6th segment 

 of pereopods VII is distinctly longer than the 5th. The lower distal angle 

 of epimerons I-III are stretched backward and are apically acute. The 

 endopodite of uropods III is narrowly oval with a sharply acute apex. 



