493 



than in pereopods I; the subchela is the same as in pereopods I. The 

 2nd segment of pereopods V is strongly broadened, slightly longer than 

 wide, and the anterior margin throughout its length bears short and sparse 

 spines; the 3rd-7th segments together are longer than the 2nd. The 2nd 

 segment of pereopods VI is narrower and longer, the anterior margin 

 armed with sparse spines, the anterior distal process large and in the 

 form of a rounded lobe that reaches the middle of the 4th segment; 

 the 4th-5th segments are distally broadened, the 4th with short anterior 

 and posterior distal processes; the 4th-6th segments have a denticulate 

 anterior margin; the 6th segment is 1.5 times longer than the 5th; the 

 claw is denticulate. The 2nd segment of pereopods VII is oval and its 

 width half its length; the distal segments together are half the length of 

 the 2nd segment; the 4th segment is broader and 1.5 times longer than 

 the 5th. 



The last urosomite is 1.5 times wider than long. The endopodite of 

 uropods I is equal to the peduncle in length and the exopodite somewhat 

 shorter. The exopodite of uropods II is equal to the basipodite in length 

 and 2/3 the length of the endopodite. The basipodite of uropods III is 

 400 wider than long and the endopodite is broadened, but less so than in 

 B. crusculum. The telson is triangular and has a rounded tip; its length 

 and width are equal to the length of the last urosomite. 



Distribution: Probably a circumtropical species. Known from the 

 Atlantic and Pacific (Kuroshio, Nasca ridge) oceans. 



3. Brachyscelus rapax (Claus, 1879) (Fig. 215) 



Claus, 1879b: 36 (Thamyris); 1887: 59 (Thamyris); Stebbing, 

 1888: 1555. — elegans Bovallius, 1887a: 31. — rapacoides Stephensen, 

 1925a: 179. 



Length of sexually mature specimens about 10 mm. 



The head in females is smoothly rounded and its height 1.5 times 

 its length; in males it is anteriorly narrowed and its length more than its 

 height. 



The basal segment of antennae II in males is considerably smaller 

 than the 1st segment of the flagellum; the distal segment is 1/5 in adults, 

 1/3-1/2 in young ones, the length of the preceding segment. 



The 2nd segment of pereopods I in males is strongly curved, in 

 females almost straight; the strongly broadened 4th segment has a straight 

 distal margin; the galeiform process of the anterior distal angle of the 5th 

 segment is well developed and straight, not curved as in B. crusculum; 

 the posterior distal angle of the 5th segment marginally bears a few 

 long narrow denticles, between each of which two-three short denticles 

 occur. The 2nd segment of pereopods II is linear and longer than in 

 pereopods I; the anterior distal angle of the 5th segment does not form 

 a galeiform process. The 2nd segment of pereopods V is oval, 1.5 times 



