143 



The spines on the distal margin of the outer lobe of maxillae I are divided 

 into two groups. The outer lobe of maxillae II is weaker than the inner 

 lobe and apically with two spines; the inner lobe has three spines. The 

 123 inner lobes of the maxillipeds are split up to the base. The 5th segment 

 of pereopods I and II are broad, almost linear. Pereopods V-VII with 

 simple nonretractile claws. 



Type species: Parascina stephenseni Pirlot, 1929. 



The genus includes four rare, poorly studied species. 



KEY TO SPECIES OF GENUS PROSCINA 



1. Proximal segment of flagellum of antennae I and 6th segment of 

 pereopods I pubescent, with numerous long setae 2. 



— Proximal segment of flagellum of antennae I and 6th segment of 

 pereopods I with few short setae 3. 



2. Inner lobe of maxillae I broadened distally; 4th segment of pere- 

 opods ni and rV more than twice longer than corresponding 3rd 

 segment; 5th segment narrow, appreciably narrower than 2nd seg- 

 ment; claws short \. P. stephenseni (Pirl.). 



— Inner lobe of maxillae I not broadened distally; 4th segment of pere- 

 opods III and rV only slightly longer than 3rd segment; 5th segment 

 almost same width as 2nd segment; claws very long and strong . . . 

 A. P. scinoides (Wolt.). 



3. Sixth segment of pereopods I shorter than 5th and with rows of 

 short setae on distal surface. Inner lobe of maxillipeds about 2/3 

 length of outer lobe. Fourth segment of pereopods V shorter than 

 5th segment 2. P. magna Steph. and Pirl. 



— Sixth segment of pereopods I longer than 5th and with only a few 

 short setae. Inner lobe of maxillipeds 1/2 length of outer lobe. Fourth 



segment of pereopods V roughly equal to 5th segment 



3. P. birsteini Vinogr. 



1. Proscina stephenseni (Pirlot, 1929) (Fig. 52) 



Pirlot, 1929: 57 {Parascina); Stephensen and Pirlot, 1931: 544; (?) 

 Barnard, 1937: 179; Vinogradov, 1957: 208. — magna (non Stephensen 

 and Pirlot, 1931); Pirlot, 1939: 25 (part.). 



Nearly sexually mature specimens have a length of 9-10 mm. 



The body is smooth, with slightly dorsoventrally flattened pereon. 

 Antennae I are slightly longer than the pereon or equal to it; the proximal 

 segment of the flagellum is armed on the dorsal surface with rows of 

 numerous long thin setae; the three distal segments are small but well 

 developed. 



