149 



and in uropods III almost similar. The telson is roundish-triangular and 

 more than half the length of the basipodite of uropods III. 



Distribution: Found in the Bering Sea (60° 47' N, 175° 38' E) in 

 catches from depths of 500-1,500 m. 



4. Proscina scinoides (Woltereck, 1906) (Fig. 55) 



Woltereck, 1906b: 866 (Sphaeromimonectes); Vinogradov, 1964: 

 127.— gracilipes [non Pirlot, 1933 (Mimoscina) : Pirlot, 1939: 29 

 (Mimoscina part.). 



Length of sexually mature female about 20 mm. 



Antennae I are equal in length to the four pereon somites; the proxi- 

 mal segment of the flagellum in young specimens is densely covered with 

 long setae on the dorsal surface, which are shed in the adult. Antennae II 

 in females thin and at least 1/4-1/2 the length of antennae I. 



The mandibles have a relatively broad, slightly denticulate cutting 

 edge; the left mandible has a small accessory plate; the distal part of the 

 anterior margin of the mandibles is armed with short setae. The outer 

 lobe of maxillae I is broad, armed with five apical spines divided into 



128 two groups by a wide gap; the inner lobe is comparatively narrow and 

 apically oval; the palp is broad and bears three small spines in the distal 

 part of the inner margin. The lobes of maxillae II are narrow, the inner 

 lobe slighdy longer than the outer; besides numerous thin setae, the outer 

 lobe also bears five and the inner lobe three apical spines. The outer lobes 

 of the maxillipeds are oval, with three short setae in the distal part and 

 one long seta on the maximally bulging part of the outer margin; the 

 inner lobes are more than half the length of the outer, broadly oval, and 

 with one small apical seta each. 



The broad 2nd segment of pereopods I is shorter than the 5th and 6th 

 segments together; the 5th segment is shorter than or equal to the conical 

 6th, with numerous long thin setae on the anterior margin; the claw is 

 1/2-2/3 the length of the 6th segment and denticulate in the proximal 

 part of its posterior margin. Pereopods II are slightly longer and thinner 



129 than pereopods I; the posterior margin of the claw is denticulate. Pere- 

 opods III and IV are considerably stronger than the preceding as well 

 as succeeding pairs of pereopods; their 4th segment is not broadened, 

 only slightly longer than the 3rd and much shorter than the broad and 

 stronger 5th segment; the 6th segment is narrow, slightly conical, some- 

 what shorter than or equal to the 5th segment; the claws are long, almost 

 straight, in young specimens only 1/2-5/6 the length of the 6th segment. 

 Pereopods V-VII are thinner and weaker in young specimens, in sexually 

 mature crustaceans they are rod-shaped; pereopods VII are particularly 

 thin and weak, though in length not less than the two preceding pairs of 

 pereopods; the almost linear 5th segment is somewhat longer than the 

 6th; the claws are strong, 2/5-1/2 the length of the 6th segment. 



