Differences between hind legs (Figure 771, A) and midlegs small. Hind 

 legs slightly paler, coxae shorter, anterodorsal setae thinner and smaller; 

 femur less convex dorsally; dorsal setae smaller and sparser, long ventral 

 setae less numerous; claw (Figure 771, B) blunt, narrower apically; basal 

 seta and processes near base less massive than on midlegs. 



Abdomen of fixed specimens yellowish white; segments 3—6 uniformly 

 broad; segments 1—2 and 7—8 slightly narrower. Segment 9 very short and 

 narrow. Integument smooth; covering chetae sparse, hairlike, small. 

 Dorsum of segments 1 and 2 convex, with grayish, narrow transverse 

 elliptical figures, which are densely covered with small hooked covering 

 spinules; these spinules form groups and are directed posteriorly. 



Primary anterior -margin dorsal setae small, light, thin, slightly larger 

 on segments 5—7 than on other segments; anterior -angle seta brownish, 

 small on segments 1 and 2, situated slightly anterior to elliptical figure on 

 segment 1, opposite ends of elliptical figure on segment 2; anterior-angle 

 seta on segments 3—7 brown, relatively large, slightly smaller than medioanal 

 seta, and situated in about the middle of segment; medioanal seta brown, 

 moderately thick, the best marked seta of dorsum; setae of both sides 

 relatively widely separated; posterior to elliptical figure on segments 1 and 2, 

 in the posterior half of sclerite on segments 3 and 7; several very small, 

 straight, light, secondary setae near the medioanal seta; intermediate and 

 lateral primary setae not distinguishable from other setae. Medioanal and 

 anterior -angle setae of segment 8 displaced toward each other in anterior 

 half, groups of posteriorly -directed, long, golden brown setae in posterior 

 half, on tubercles on sides; ventral side of segment 8 with a small brownish 

 sclerite on each side; 2 golden brown setae, one longer and thicker than 

 other near posterior margin of these sclerites. 



Gills forming 2 pleural and 2 ventral rows; pleural gills present on 

 segments 2—7; upper pleural gills situated postsegmentally consisting of 



1 branch; lower pleural gills situated presegmentally, with 2 branches; 

 medioventral gills with 1 branch situated in middle of segment on 

 segments 1 — 6; outer ventral gills situated more posteriorly; they have 



2 branches on segments 1—4, 1 branch on segments 5—7; number of gill 

 filaments and arrangement of gills given in Table 30. 



TABLE 30 



Segment 



Pleural 



Ventral 



upper 



lower 



lateral 



median 



Meso thorax 

 Metathorax 



1 



2 



3 



4 



5 



6 



7 



14 

 20 

 18 

 13 

 19 

 12 



14+16 

 21+22 

 21+18 

 16+21 

 21+20 

 16+18 



13 



16 

 12+13 

 20+15 

 20+19 

 23+20 



15 



21 



22 



12 

 18 

 17 

 15 

 14 

 14 

 11 



626 



