Arrangement of gills and number of gill filaments of 

 D.palatus 



Segment 



Dorsal 



Pleural 



Ventral 



2 



4 

 4 



4 



4 



4 



4 



3 



4 

 4 



4 



3 



4 



4 



4 



4 

 4 



3 



3 



4 

 4 



5 



3 

 3 



2 



2(3) 



3 



4 



6 



3 

 2(3) 











3 



4 



7 



3 







3 

 3 



69 



Abdominal segment 1 slightly darker and shorter than the others; dorsal 

 and lateral processes of moderate length; segment with short, thick, black 

 setae on small sclerotized dots lateral to the dorsal process and dorsal 

 to the lateral processes; similar dots and setae ventrally on a large 

 elliptical median elevation and small, rounded lateral elevations. 



Lateral line on segments 3—8 with fine, dense, golden brown hairs. 



Gills on segments 2 — 7 (Figure 114). 



Tergite of abdominal segment 9 (Figure 115) golden brown, short, 

 transverse, with 2 rows of sm.all dots near anterior margin; medioanal seta 

 thick, long; anterior -angle seta almost the same; thin, long, intermediate 

 setae and a lateral seta between them and also an anterior -margin seta, 

 which is similar but slightly smaller; 10—12 secondary setae, including 

 2 large, long setae, situated submarginally between the medioanal setae; 

 the secondary median setae m^ay be of different lengths in some specimens, 

 like the lateral and intermediate primary setae. 



Sclerite "b" of anal legs chestnut brown, with 4 long, black, marginal 

 setae dorsally, with one black, long and 2 short, thin setae distally; 

 distoventral seta short, thin; dorsal surface of sclerite with 10—12 secondary 

 setae. 



Sclerite "c" triangular, reddish brown, with broad, black, outer margin; 

 a small, blackish brown seta near the posterior angle. 



Claw (Figure 116) basally, and partly apically, reddish brown with blackish 

 curved apex and 2 dorsal denticles; setae 1, 2, and 3 situated dorsally, 

 thin; seta 6 thick, dark, situated on outer side; seta 5 small, situated near 

 suture; seta 4 small, situated in basal area, thick; setae 7 and 8 light, of 

 equal length. 



Case (Figure 117) to 26— 28mm long, slightly curved, slightly compressed 

 dorsoventrally, rounded posteriorly, made entirely of detritus by young 

 larvae, while made posteriorly of detritus and anteriorly of sand grains by 

 larvae of medium age, full-grown larvae make case entirely of dense, large, 

 sand grains; sand grains larger on sides of case; ventral side flattened, 

 posterior opening round. 



