201 



on all the three sides. The telson is almost twice longer than its basal 

 width, with an acute tip. 



168 Notes: In the proportions of the last three pairs of pereopods, the 

 structure of the claw of pereopods VII, some structural details of the 

 mouthparts, and the number of gills, S. stenopus comes close to the 

 group of species rattrayi; contrarily, in length of antennae I it is closer 

 to the crassicornis group. 



Distribution: It is a warm-water species known from different 

 regions of the Atlantic Ocean (from 46° 15' N to 35°35' S, 18°20' E), 

 from the Mediterranean Sea, and from many points in the northern part 

 of the Indian Ocean (except the Arabian Sea) where its southernmost 

 report refers to 29°7' S, 40°46' E and 27° 58' S, 91°40' E. In the Pacific 

 Ocean it is found only at one station (30°53' N, 153°09' E). It inhabits 

 the intermediate layer between 100 and 500 m but is found in catches 

 from depths of 500-1,000 m and in horizontal catches from depths of 

 600 and 625 m. 



20. Scina tullbergi (Bovallius, 1885) (Fig. 81) 



Bovallius, 1885b: 15, 1887b: 532, 1887c: 23 {Tyro)\ Vosseler, 

 1901: 113; Wagler, 1926: 384, 1927: lOl.—pacifica Bovallius, 1887b: 

 25, 1887c: 4 (Tyro); vosseler, 1901:113; Tattersall, 1905:14; 

 Stephensen, 1918: 29.— concors Stebbing, 1895: 360. 



One of the smallest Scina species. Length of sexually mature indi- 

 viduals 2.0-4.5 mm. 



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

 short, not exceeding the pereon in length. The mouth cone is small. The 

 outer lobes of the maxillipeds are long, oblong-oval, tapering distally, 

 with a rounded apex; the inner lobes are very short, only 1/12-1/8 the 

 length of the outer lobes and with two apical setae. 



Pereopods I have broad segments; the 2nd segment is slightly shorter 

 than the 5th and 6th together; the 5th segment is longer than the 6th; 



169 the claw is long, thin, and slightly curved. Pereopods II are longer and 

 weaker than pereopods I; the 6th segment is the same length as the 5th 

 or somewhat longer; the claw is long, thin, and straight. Pereopods III 

 and IV are identical in structure but pereopods IV are somewhat longer; 

 the 5th segment is somewhat longer than the almost mutually equal 4th 

 and 6th segments; the claw is slightly curved. Pereopods V are long and 

 strong; the 2nd segment is armed on the posterior margin with long and 

 slightly curved spines while the anterior margin is smooth; the distal pro- 

 cess is shorter than the 3rd segment, with a solitary denticle at its base; 

 the 4th segment is only slightly shorter than the 2nd and almost twice 

 longer than the 5th; the 6th segment is equal to the 5th or shorter, some- 

 times being 1/2-2/3 its length; the claw is slightly curved. Pereopods VI 



