145 



surface; the claw is thin, almost straight, 2/7-2/5 the length of the 6th seg- 

 ment. Pereopods II are slightly longer than pereopods I; the 5th segment 

 is almost 1/2 the length of the 6th; the claw is 1/4-1/2 the length of the 

 6th segment, in females relatively shorter than in males. Pereopods III 

 and IV are similar in size and structure; they are not only longer than the 



124 stronger pereopods I and II but even the weaker pereopods V-VII; the 

 2nd segment is shorter than the 4th and 5th together; the length ratios of 

 the distal segments (4th, 5th, and 6th) is roughly 7/10/9. Pereopods V and 

 the still slightly shorter pereopods VI are similar in size ratios; their 2nd 

 segment is only slightly shorter than the 4th and 5th segments together, 

 while the distal segments are almost equal to each other (ratio 8: 8: 7). 

 Pereopods VII are only slightly shorter than pereopods VI and have the 

 same length ratios. The claws of pereopods V-VII are small, short, and 

 slightly curved. 



The uropods have narrowly lanceolate, denticulate rami; the 

 endopodite of all the uropods (especially uropods I and II) is longer than 

 the exopodite. The basipodite of uropods III is broader (especially in 

 males) than in the preceding two pairs. The distal part of the endopodite 

 of uropods III is curved and broadened in males but normal in structure 

 in females. The telson is triangular oval and does not reach 1/2 the length 

 of the basipodite of uropods III. 



Distribution: Known from the North Atlantic (47° 10' N, 18°02' W), 

 the Arabian Sea, and northwestern part of the Pacific Ocean (44°07' N, 

 150° 32' E). All specimens were found in through catches from depths 

 greater than 1,500 m up to the surface. 



125 2. Proscina magna Stephensen and Pirlot, 1931 (Fig. 53) 



Stephensen and Pirlot, 1931: 545; Pirlot, 1939: 25 (part.); Vino- 

 gradov, 1957: 210. — -fowleri Chevreux, 1905: 3; (Parascina part.). 



Two specimens of this species are known: female — length 18 mm 

 and male — length 9 mm. 



In body shape this species is identical to P. stephenseni but the 

 appendages are shorter and stronger. 



The proximal segment of the flagellum of antennae I is less 

 pubescent than in P. stephenseni. Antennae II in the sexually mature 

 male are slightly longer than antennae I; the first two segments of the 

 peduncle are fused; the 3rd is short, the 4th and 5th segments long and 

 thin; the four-segmented flagellum is slightly longer than the 5th segment 

 of the peduncle. 



The mandibles are narrow and strong; the cutting edge is narrow, 

 bent, and finely denticulate; the width of the accessory plate is nearly 

 half of the cutting edge; the distal part of the inner surface of the body 

 of the mandible is covered with numerous short setae. The inner lobe of 

 maxillae I is broad, the spines on the distal margin distinctly divided into 



