220 



uneven distal margin; the inner lobes are long, reaching half the length 

 of the outer lobes, and bear two apical setae. 



Pereopods I and II are similar in structure, as in the species of the 

 tullbergi group. Pereopods III and IV are identical in structure; the length 

 ratios of the 2nd, 4th, 5th, and thin 6th segments are 20:10:13.5:12. The 



183 claws of the first four pairs of the pereopods are long and almost straight. 

 The 2nd segment of pereopods V is denticulate on the anterior and poste- 

 rior margins; on the posterior margin the denticles are very small and on 

 the anterior margin they are sparser and larger; the anterior distal angle 

 is produced into a small process, usually not reaching the distal margin 

 of the 3rd segment; the 4th segment is roughly half the length of the 5th; 

 the very thin 6th segment is only insignificantly shorter than the 5th; the 

 claw is unsually long and thin. Pereopods VI are almost the same length 

 as pereopods V; the rod-shaped thin 2nd segment is somewhat shorter 

 than the 4th and 5th segments together; the 5th segment is 2/3 the length 

 of the 4th and is equal to the 6th; the claw is short, strong, and falcate. 

 Pereopods VII are short and less than 1/2 the length of pereopods VI; the 

 4th and 5th segments are almost equal and each is considerably shorter 

 than the 6th; the claw is very small, with a broadened base, and curved 

 thin distal part. 



The uropods are narrow and strongly armed; the basipodites are 

 shorter than the endopodites. In uropods I the anterior margin of the 

 basipodite, the inner margin of the endopodite, and the entire posterior 

 margin are coarsely denticulate. In uropods II the entire posterior margin 

 is denticulate. In uropods III the inner margin of the exo- and endopodite 

 is denticulate. The telson is triangular, its length more than its width, and 

 the tip acute. 



Distribution: Atlantic Ocean (from 51°N, 11°34' W to 28°28' S, 

 6° 13' E) and tropical part of the Indian Ocean (the southernmost 

 record — 34° 14' S, 80° 31' E). In the Pacific Ocean it is found around the 

 Hawaiian Islands and in the Tasman Sea (Great Barrier Reef)- Around 

 the Canary Islands it is found in horizontal closed catches at depths from 

 200 to 940 m, and in the region of the Hawaiian Islands at a depth of 

 450-600 m. 



184 31. Scina inermis Chevreux, 1919 (Fig. 92) 



Chevreux, 1919: 7; Wagler, 1926: 413. 



Length of sexually mature specimens about 4 mm. 



The body is without keels; the dorsal keels on the head are weakly 

 developed. Antennae I are roughly the same length as the pereon. The 

 protopodite of the maxillipeds is trapezoid, very short and broad at the 

 base; the outer lobes are small, oval, with a blunt tip, and bear two setae; 

 the inner lobes are unarmed and fall slightly short of 1/2 the length of 

 the outer lobes. 



