I] 



STRUCTURAL AND SYSTEMATIC 25 



Another type of structure is offered by the 

 Eudrilid earthworms which form rather a restricted 

 family. These worms are as a rule quite easy to 



IS 9 



P 



Fig. 9. Ventral view of Polytoreutus Kilindinensis, head end (x 2). 

 p papillae, <? male pore, ? female pore. 



distinguish by their external characters only. For 

 the apertures of the spermathecae and sperm ducts 



