491 



Length of sexually mature female up to 21 mm, of male up to 

 17 mm. 



The head is large, in females anteriorly smoothly rounded, its height 

 1.5 times its length; in males the head is anteriorly narrowed, its length 

 and height approximately equal. 



The 1st segment of the flagellum of antennae I in males is broad 

 and upcurved; the three distal segments are thin and short. Antennae I 

 in females are very small, the flagellum three-segmented. The distal seg- 

 ment of antennae II in males is 1/5 the length of the preceding one. The 

 pereon is somewhat longer than the pleon. 



The 2nd segment of pereopods I in males is sharply curved in the 

 middle, in females almost linear; the 4th segment is 1 .5 times wider than 

 long; the anterior distal angle of the 5th segment forms a galeiform pro- 

 cess with small denticles on the rounded apex, the posterior angle forms 

 an acutely angled lobe whose posterior margin is straight and generally 

 bears eight-nine denticles, its anterior margin with five-seven denticles; 

 both margins in the 6th segment are bulged and the posterior one den- 

 ticulate in the distal part; the claw is strong and approximately half the 

 length of the 6th segment. The 2nd segment of pereopods II is straight 

 in both males and females; the 5th segment is much narrower than in 

 pereopods I, the anterior galeiform process is absent, the posterior distal 

 lobe well developed, and the posterior margin is armed with five-six, 



397 the anterior margin with five-eight denticles. The 2nd segment of pere- 

 opods V on average is 10/17 as wide as long and its anterior margin may 

 bear up to 10-15 smoothened denticles with short spines; the 4th and 5th 

 segments are equal in length; the 6th segment is longer than the 5th. The 

 2nd segment of pereopods VI is equal to the 5th in length but broader 

 and its anterior margin armed as in pereopods V; the 3rd-7th segments 

 together are not longer than the 2nd; the 4th-6th segments have a den- 

 ticulate anterior margin; the 6th segment is longer than the 5th. The 2nd 

 segment of pereopods VII is 1.3 times longer than wide and its posterior 

 margin more bulged than the anterior one; the distal segments together 

 are only slightly longer than half the 2nd segment; the 4th segment is 

 almost twice as broad and longer than the 5 th. 



The basipodite of uropods I is shorter than the narrow lanceolate 

 rami; the endopodite is longer than the exopodite. The rami of uropods II 



398 are broadened in the middle part and lanceolate. The basipodite of 

 uropods III is short, the rami broadened in the distal third, especially 

 the endopodite. The last urosomite is equal in length and width. The 

 telson is longer than its width at the base and equal in length to the last 

 urosomite; the tip of the telson in females is extended, often pointed, in 

 males rounded. 



