206 



longer than the 6th segment; the claw is very small. Pereopods VI are 

 somewhat shorter than pereopods V, the 2nd segment is equal to the 4th 

 and 5th together, the 4th segment is 1.5 times longer than the 5th, the 

 thin 6th segment is slightly longer than the 4th, but considerably longer 

 than the 5th; the claw is very small and curved. Pereopods VII are short, 

 the 4th segment is slightly longer than the 5th, which in turn is slightly 



172 longer than the 6th; the claw is short with a broadened base and a bent 

 acute tip. 



In uropods I only the inner margin of the endopodite is denticulate. 

 In uropods II the distal half of the posterior margin is finely denticulate, 

 while in uropods III the inner margin of the exo- and endopodite is 

 denticulate. The telson is triangular with an acute tip. 



Distribution: Tropical regions of the Atlantic and Indian oceans, east- 

 ern tropical part of the Pacific Ocean (Californian coasts), and Antarctic 

 waters (one report — 64°29' S, 85°27' E). It is found in catches from 

 depths of 100-200, 200-500, 1,000-2,000 m and in total catches from 

 depths of over 2,000 m to the surface. 



23. Scina setigera Wagler, 1926 (Fig. 84) 



Wagler, 1926: 396. 



A very small species of Scina, of roughly the same size as S. tullbergi 

 and S. similis. 



The body is smooth and without keels. Antennae I are strong and 

 shorter than the pereon. The mouth cone is small. The protopodite of 

 the maxillipeds is almost rectangular and only slightly broadened at the 

 base; the outer lobes are broad and oval, and the inner lobes are very 

 small and unarmed. 



Pereopods I-IV have a broad 2nd segment. In pereopods I the 5th 

 segment is somewhat longer than the 6th and together they are longer 

 than the 2nd segment; the claw is long and almost straight. In pere- 

 opods II the 5th and 6th segments are almost equal in length; the claw 



173 i? long and almost straight. The proportions of pereopods III and IV are 

 the same as in S. tullbergi; the 5th segment is somewhat longer than 

 the 4th or the 6th, which are mutually almost equal in length; the claw 

 is long and slightly curved. The 2nd segment of pereopods V is armed 

 on the posterior margm with long, slightly curved denticles, the anterior 

 margin is smooth with two strong denticles only at the base of the short 

 distal process; the length ratios of the 2nd, 4th, 5th, and 6th segments 

 are 12.5:10:7:5; the 6th segment in the distal part of the posterior margin 

 bears a solitary strong and very long seta which projects far above the 

 small slightly curved claw; a similar seta is found on pereopods VI also. 

 Pereopods VI are somewhat shorter than pereopods V; the length ratios 

 of the 2nd, 4th, 5th, and 6th segments are 15:10:8:9; the claw is similar to 

 that in pereopods V. Pereopods VII are short but strong; the 5th segment 



