186 



the particularly broad rami (type latipes) are typical of sexually mature 

 males but subsequently sexually mature females were found with simi- 

 larly broad uropodal rami. Evidently, this species could be divided into 

 subspecies, as was mentioned by Wagler (1926), but the paucity of mate- 

 rial does not yet permit a justifiable separation. 



Distribution: Atlantic Ocean from 53° N, 15° W to 55°57' S, 

 16° 15' E, Indian Ocean north of 30° S, Pacific Ocean from the south- 

 157 western part of the Bering Sea to 38° 16' N, 143°48' E. In the northern 

 part of the Pacific Ocean it is found in catches from depths of 200-500, 

 500-750, and 1,000-4,000 m but in the tropics found and at lesser depths, 

 in catches from 40 and 150 m. 



14. Scina rattrayi Stebbing, 1895 



Stebbing, 1895: 358, 1904: 26; Chevreux, 1900: 123; Lo 

 Bianco, 1901: 446; Tattersall, 1905: 10; Stephensen, 1918: 29; Wagler, 

 1926: 375, 1927: 104; Vinogradov, 1964: 136.— bovallii Vosseler, 

 1901: 105. 



Length of sexually mature specimens 2.5-6.0 mm. 



The body is smooth, flattened, and without keels. Antennae I are 

 strong, roughly equal in length to the pereon. Maxillae I and II are 

 very small. The maxillipeds are large, their outer lobes are oblong-oval, 

 slightly tapering distally, and with rounded distal end; the inner lobes 

 are very short, reduced to a small trapezoid plate. 



The pereopods are long and thin. The 5th segment of pereopod I is 

 slightly longer than the 6th, and together they are longer than the 2nd seg- 

 ment; the claw is long, thin, and almost straight. Pereopods II are almost the 

 same length but somewhat weaker; the 5th and 6th segments are roughly 

 equal in length; the claw is long, thin, and almost straight. Pereopods III 

 and IV are identical in structure and longer than the first pair; the 5th 

 segment is longer than the 6th, which in turn is longer than the 4th seg- 

 ment; the claw is thin, not long, and slightly curved. Pereopods V are long 

 and thin; their rod-shaped 2nd segment is 2.5 times longer than the 2nd 

 segment of the preceding pairs; it bears long, slightly curved denticles 

 along the entire posterior margin but only two (rarely three or four) such 

 denticles occur on the anterior margin in its distal part; the distal process 

 is very small, shorter than the 3rd segment; the 4th segment is usually 

 only slightly shorter than or equal to the 2nd segment but is much thinner; 

 the 5th segment is half the length of the 4th, while the 6th segment is 

 1/2 or 1/3 the length of the 5th; the claw is very small, wedge-shaped. 

 In some individuals the 6th segment is more than half but nevertheless 

 still markedly shorter than the 5th segment while the claw is longer; these 

 individuals als^o deviate in some other features from the type, coming close 

 to another closer species, 5. antarctica. Pereopods VI are also very long 

 and thin but none the less somewhat shorter than pereopods V; the 2nd 



