523 



its width on the distal margin twice that at the base, and equal to the 

 length of segment; the posterior distal angle is roundly extended and 

 armed with stiff denticles, of which the apical is the largest; the 6th 

 segment is relatively broad, its anterior margin strongly bulged, and its 

 posterior margin distally denticulate, straight, or slightly bulged distally; 

 the claw is slightly curved and has a denticle in the middle of the posterior 



422 margin; the 5th-6th segments bear spiniform setae on the posterior side. 

 The 2nd segment of pereopods 11 has a barely bulged anterior margin 

 and is longer than the rest of the leg; the projection of the posterior distal 

 margin of the 5th segment is pointed and the apical spine reaches the 

 distal margin of the 6th segment; the 6th segment is relatively narrow 

 (width much less than half the maximum width of the 5th segment) and 

 the margins are parallel. The ornamentation of pereopods II is similar to 

 that in pereopods I. 



The 2nd segment of pereopods V is elongated-oval, its maximum 

 width occurring in the proximal part, the anterior margin straight, the 

 posterior one bulged, and isolated setae arranged regularly on both sides; 

 the 4th-6th segments have finer setae on the anterior margin, while in 

 each successive segment the setae are denser. The 2nd segment of pere- 

 opods VI is broader than in pereopods V, oval or ovate, smooth, has a 

 uniformly bulged anterior and proximally bulged posterior margin, and 

 is equal in length to the rest of the leg; ornamentation of the 4th seg- 

 ment is quite specific: a pecten of fine stiff denticles; the 6th segment 

 has larger spines on the anterior margin separated by groups of smaller 

 ones. Pereopods VII usually have a full complement of segments, but 

 sometimes the distal part of the leg consists of just three segments; the 

 coxal plate is almost the same size as the 2nd segment and its lower 

 angle extended backward. The shape of pereopods VII is highly vari- 

 able, of no taxonomic significance, and cannot serve as a criterion for 

 separating infraspecific categories or independent species. 



Epimeral plates I-II are roundish and the posterior distal angle of 

 epimeral plate III is extended and pointed. Urosomite I is almost square; 

 the geminate urosomite is very long. 



423 The basipodite of uropods I is narrow, reaching the base of the tel- 

 son, extending beyond the end of the basipodite of uropods II, and its 

 sides denticulate, the inner margin more finely so than the outer; the 

 exopodite is lanceolate and similar in denticulation to the basipodite; 

 the endopodite is greatly reduced, 1/7-1/6 the length of the exopodite, 

 and also has denticulate margins. The basipodite of uropods II is also 

 denticulate; sexual dimorphism is manifest not only in fusion of the 

 basipodite with the exopodite in females but even in the ornamenta- 

 tion of the endopodite: in females the margins of the endopodite have 

 smooth denticles, while in males the denticles on the outer margin of 



