366 



298 margin bears one or several long setae; much shorter setae are present 

 also on the surface of the lobe; the basal segment bears a row of setae 

 along the anterior margin. 



Pereopods I are strong; the conical 6th segment is somewhat shorter 

 than the distally broadened 5th segment, and both segments bear numer- 

 ous setae on the anterior and posterior margins and on the surface; the 

 claw is strong, slightly curved, and very finely denticulate in the dis- 

 tal part of the inner margin. The distal process of the 5th segment of 

 pereopods II extends to the distal end of the 6th segment, both its mar- 

 gins bear short and strong setae, and the process terminates in a short 

 and strong apical spine; the conical 6th segment bears long setae on the 

 anterior margin. The 2nd segment of pereopods III is broad and tapers 

 in the proximal part; the 4th segment is short and trapezoid; the 5th 

 segment is braodly oval, its maximum width 2/3 its length; the narrow 

 6th segment is slightly curved, and equal to or somewhat longer than the 

 5th; the claw is strong and bears a fascicle of short setae in the prox- 

 imal part of the posterior margin. Pereopods IV are longer but the 5th 

 segment relatively narrower. Pereopods V are significantly longer than 

 all the other legs; the broad 2nd segment has a straight posterior margin 

 while its anterior margin is concave in the proximal part; the 3rd and 4th 



299 segments are very short; the strong 5th segment is broad in the proximal 

 part, gradually tapers distally, and is sometimes club-shaped, the narrow 

 6th segment is straight, and equal in length to the 3rd, 4th, and 5th or 

 the 4th and 5th segments together; the anterior margin of the 5th and 6th 

 segments bears a row of sparse strong setae of equal length with a pecten 

 of numerous very short and thin setae between them; the claw is slightly 

 curved, 1/10-1/6 the length of the 6th segment, and bears a fascicle of 

 short setae in the proximal part of the anterior margin. Pereopods VI and 

 Vn are almost identical in length and structure; the 2nd segment is broad 

 and linear or its margins are concave in the middle part; the 4th segment 

 is almost half as wide as long; the 5th segment is linear and equal to or 

 slightly shorter than the much narrower 6th segment; the claws have a 

 fascicle of setae on the anterior margin. 



The uropods are long and narrow; the endopodites of uropods I and 

 II are equal to the basipodites while the exopodites are shorter. The rami 

 of uropods III are broad and shorter than the basipodite; the inner distal 

 angle of the basipodte is acute and stretched. The margins of the rami 

 have fine denticulation which is poorly noticeable. The oblong-triangular 

 telson has an acute apex. 



Distribution: A circumpolar cold-water species. It inhabits the Cen- 

 tral Polar Basin, where it was found right up to the Polar region and 

 peripheral Arctic seas. In the Atlantic Ocean it moves with cold waters 

 along the coasts of America up the Gulf of St. Lawrence and coasts of 



