Longitudinal 

 / views \ 



— Prostomium — 



SETAE 



4 



Peristomium 

 Segment II- 



Pharyngeal 

 gland 



Hair seta 



Dorsal bloodj 

 vessel 



Ventral vessel 

 Nerve cordi 



Gut 



//I 



Dorsal setae 



Anterior 







i"'-d ■■*■-■■■ ,- ,- » :. ". 



f - ' , ■ - ■ ■ ^^^ » ■ - -r 



sperm sac 



Testis 

 SpermathecaJ 



Clitellum 



Ovary^ 



Vas deferens! 



Atrium^ 

 Penis- 

 Prostate - 



Penial seta 



Female^ 

 funnel ®"^ 



Brain 



Pharynx 



hair 



smooth 



lateral 

 hairlets 



serrate 



uppet tooth 



round simple 



bifid 



Figfure 2. — Left, exterior of anterior portion of an oligochaete; middle, interior view; right, 



basic types of setae. 



