354 



and the 3rd-6th along the posterior margin as well; the posterior mar- 

 gin of the 2nd segment is finely denticulate. Pereopods VII are similar 

 to pereopods V and VI in structure and about the same length as pere- 

 opods III and IV. The lower distal angle of epimerons I-III is acute. Both 

 sides of the basipodite of uropods I but only the outer side in uropods II 

 and III bear minute setae. Both margins of the rami of all the uropods, 

 289 except the outer side of the outer ramus, are denticulate. The telson is 

 triangular, with an acute apex. 



Distribution: Known from Antarctic waters at high latitudes. 



7. Hyperoche luetkenides Walker, 1906 



Walker, 1906: 453. 



Male 12 mm in length. 



The 3rd segment of the mandibular palp is equal in length to the 

 1st and 2nd segments together. In pereopods III the 4th segment has a 

 process on the posterior margin which resembles a strongly denticulate 

 tooth; in pereopods IV this process is smaller and not denticulate but 

 the curved part of the distal margin of the 4th segment between the 

 process and the base of the 5th segment is denticulate. In pereopods IV 

 the posterior margin of the 4th and 5th segments is not denticulate; in 

 pereopods V the 5th segment is curved. The telson is triangular, with a 

 rounded apex, its length more than its width at the base and equal to half 

 the length of the basipodite of uropods IV. 



Distribution: The only known specimen was found in the Pacific 

 sector of the Antarctic (57°25' S, 151°43' E). 



5. Genus Laxohyperia Vinogradov and Volkov, gen. n. 



Small animals, less than 5 mm in length. 



All the somites of the pereon are free, somites V-VII being lower 

 and narrower than the preceding ones. The epimerons are not well devel- 

 oped, due to which the posterior part of the body appears thin. The head 

 is higher than the pereon, its height more than its length, and longer 

 than somites I and II of the pereon together. The interantennal lobe is 

 not developed. The eyes are large, occupy the lateral surface of the 

 head, and are dorsally contiguous. Antennae I in females have a three- 

 segmented peduncle and a one-segmented, narrowly conical flagellum; 

 antennae II are four-segmented. A mandibular palp is present in females. 

 Maxillae I bear short apical spines on the outer lobes. The maxillipeds 

 have developed inner lobes that are only slightly smaller than the outer 

 in length. The coxal plates are free. Pereopods I and II have a poorly 

 developed chela formed by the petaloid distal process of the 6th seg- 

 ment and the petaloid posterior part of the 6th; the claws are attached 



