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 



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

 2} papillae, c? male pore, ? female pore. 



distinguish by their external characters only. For 

 the apertures of the spermathecac and sperm ducts 



