274 



of the posterior margin of the 5th segment bears one very small seta 

 while that of the 6th segment has an indistinct denticulate broader with 

 individual setae. Pereopods V-VI are similar; the claw is 2/5 the length 

 of the 6th segment; the 4th segment has solitary setae along its anterior 

 margin; the 5th-6th segments are finely denticulate along the anterior 

 margin. The 2nd segment of pereopods VII is less than 1/3 the length of 

 226 the entire leg, its width is less* than its length; its margins are parallel, 

 the posterior lobe stretched downward to the end of the 3rd segment, 

 the anterior margin slightly concave, and the distal angle stretched (as in 

 V. stebbingi); the length ratio of the 4th-7th segments is 9:13:17:10; each 

 successive segment is narrower than the preceding one; the 7th segment 

 is finger-shaped and has a characterisfic squamose pattern on its surface. 

 The urosome is somewhat longer than somite III of the pleon but the 

 posterior lateral angles are not prominent. The basipodites of the uropods 

 are longer than the rami and their inner distal angles acutely stretched; 

 the basipodites of uropods I-II extend to the middle of the basipodite of 

 uropods III and bear strong denticles on the outer margin. The rami of 

 uropods I are equal in length; the exopodite has a coarsely denticulate 

 outer margin while the proximal 2/3 of the inner margin is finely den- 

 ticulate and the distal part bears large denticles; in the endopodite the 

 margins are distally boldly denticulate, the proximal half of the outer 

 margin finely denticulate and the inner margin smooth. The exopodite of 

 uropods II has a coarsely denticulate outer margin while the proximal 3/4 

 of the inner margin is finely denticulate, with a large denticle distally; 

 the endopodite is shorter than the exopodite, with a finely denticulate 

 outer margin and an uneven inner margin without distinct denticles. The 

 basipodite of uropods III is distally armed with very minute denticles; 

 the rami in both sexes are equal in length, similar in shape, and finely 

 denticulate along the sides facing each other; the exopodite has a smooth 

 outer margin; the inner margin of the endopodite is uneven. The telson 

 is elongated-triangular, apically rounded, and extends to the middle of 

 the basipodite of uropods III. 



Distribution: Northwestern part of the Pacific Ocean, southwestern 

 part of the Bering Sea, and Bussol Strait. 



12. Vibilia armata Bovallius, 1887 (Fig. 112) 



Bovallius, 1887b: 69; Behning, 1912: 213; Stephensen, 1918: 46; 

 Behning, 1925: 491. — gracilis Bovallius, 1887b: 65. — gracilenta Boval- 

 lius, 1887b: 67.— erratica Chevreux, 1892b: 32. 



Body length up to 1 1.2 mm, on average 5-7 mm. In the tropical part 

 of the area of its distribution, females with eggs have been recovered, 

 measuring no more than 5 mm in length. 



Changed from Russian original by author — ^Eds. 



