180 



posterior margin (finely), with a long distal process with a denticle on 

 the anterior margin; the 4th and 5th segments are equal in length; the 

 6th segment is shorter than either of them; the claw is short and curved; 

 the surface of all the segments is covered with a large number of fine 

 setae. Pereopods VI are roughly the same length as pereopods V, and 

 have roughly the same segment length ratios although the 2nd segment 

 is somewhat shorter, and the 6th segment is longer than in pereopods V; 

 as in pereopods V, the surface of the segments is covered with a large 

 number of fine setae. Pereopods VII are strong and slightly shorter than 

 pereopods VI; the distal segments are short and broad; the 5th segment 

 is somewhat longer than the almost mutually equal 4th and 6th segments; 

 the claw is short and uncinately curved. 



Uropods I bear long, slightly curved spines on the posterior margin 

 and are finely denticulate on the entire anterior margin. Uropods II are 

 152 smooth on the anterior margin and finely denticulate on the posterior 

 margin. The posterior margin of uropods in is smooth; the anterior mar- 

 gin of the basipodite is smooth and the posterior margin denticulate. The 

 telson is oblong-oval with an acute tip. 



Distribution: Equatorial and southern parts of the Atlantic Ocean 

 and the northern part of the Indian Ocean (Zanzibar, southern part of 

 the Arabian Sea and east of Sri Lanka). It is found only in total catches 

 from depths of not more than 1,(X)0 m to the surface. 



11. Scina stebbingi Chevreux, 1919 (Fig. 70) 



Chevreux, 1919: 1; Wagler, 1926: 356; Vinogradov, 1957: 215, 

 1970: 394.— armauer-hanseni Pirlot, 1929: 72. 



Size of known specimens 8-13 mm; sexually mature specimens have 

 not been found. 



The body is smooth; weakly developed crests are present only on the 

 head. Antennae I constitute roughtly 1/3 the body length and are equal 

 to or shorter than the pereon; they are armed very weakly or not at all. 



The outer lobes of the maxillipeds are oblong-oval and their rel- 

 ative length varies greatly — in Wagler' s illustration (Wagler, 1926) for 

 the almost sexually mature male the ratio of length of lobes to breadth 

 is 3:1 and in the sexually immature female examined by us, 2:1 (Vino- 

 gradov, 1957); the inner lobes in Wagler' s specimen reach 1/3 and in 

 our specimen 1/2 the length of the outer lobes. 



Pereopods I are equal in length to pereopods II but are slightly 

 stronger; the 5th segment of pereopods I is longer than the 6th. In pere- 

 opods II these segments are equal in length and the claw is relatively 

 short and slightly curved. Pereopods III and FV are much longer and 

 stronger than the first pair; the 6th segment is somewhat shorter than 

 the 4th, which in turn is shorter than the 5th; the claw is short and 

 153 curved. The last three pairs of pereopods are devoid of setae. The 2nd 



