191 



the 5th but shorter than the 6th (their length ratios are 6:5:7); the claw 

 is relatively long, thin, and slightly curved. Pereopods VII are short and 

 weak but relatively longer than in S. rattrayi; the 2nd segment in the 

 distal part of the anterior margin may have one-two small denticles; the 

 5th segment is slightly shorter than the 4th or the 6th; the claw is short 

 and curved. 

 161 Uropods I are finely denticulate along the entire anterior margin 



and bear long curved spines on the posterior margin of the basipodite. 

 Uropods II are denticulate on the anterior margin of the basipodite and 

 along the entire posterior margin. Uropods III bear sparse long spines on 

 the posterior margin of the basipodite. The telson is narrowly triangular 

 and with an acute tip. 



Notes: This species is very close to S. rattrayi and some specimens 

 have been found with mixed features of both the species. 



Distribution: The atlantic, Indian, and Pacific sectors of Antarctica 

 from the coastal regions of Antarctica to the zone of Antarctic cov- 

 ergence. Isolated specimens are reported farther north in the tropical 

 regions of the Indian Ocean (between the Seychelles and Chagos islands) 

 and in the southern part of Atlantic Ocean where they evidently enter 

 with the flow of antarctic deep waters. Found only in total catches from 

 depths of over 1,000-2,000 m up to the surface. 



16. Scina oedicarpus Stebbing, 1895 (Fig. 76) 



Stebbing, 1895: 356, 1904: 25; Chevreux, 1919: 12; Wagler, 1926: 

 369; Vinogradov, 1960a: 232, 1964: 136. — megamerosCh&\xe\xx, 1919: 1. 



Length of sexually mature individuals 7.5-8.0 mm. 



The broad pereon tapers abruptly behind somite V; the weakly devel- 

 oped keels are visible on the dorsal side. The eyes are small. 



Antennae I are slightly shorter than the pereon and the pleon 

 together.The mouth cone is relatively small. The outer lobes of the 

 maxillipeds are lanceolate and taper distally; the inner lobes have a 

 rounded distal end and reach 1/4 the length of the outer lobes. 



The pereopods are long and thin. In pereopods I the 5th segment is 

 longer than the 6th, in pereopods II it is roughly equal in length; the claw 

 is long and straight. Pereopods III and IV are alike in structure; their 5th 

 segment is somewhat longer than the thin 6th segment and markedly 

 longer than the 4th; the claw is thin, comparatively short, and slightly 

 curved. Pereopods V are conspicuous by their length; the rod-shaped 2nd 

 segment is armed on the anterior and posterior margins with numerous 

 slightly curved and long denticles; its distal process is longer than the 3rd 

 segment, slightly curved or straight, with denticles on the anterior margin; 

 specimens are known in which the anterior margin of the segment is 

 armed very weakly; the 4th segment is considerably longer than the 

 5th, which in turn greatly (sometimes more than twice) exceeds the 



