256 Froceedings of the Royal Physical Society, 



1. Family Eudrilidse.^ 



Male aj^ertures single or paired on xvii^/i segment. Clitellum 

 occupying segments xiii.-xvii. j both oviducts and sperm 

 . ducts with a muscular coat. 



Genera — Eudrilus, Teleudrilus^ Nemertodrilus, Polytor- 

 eutuSy Stuhlmannia. 



The mutual relationships of the Acanthodrilini are, I 

 think, fairly clear from what has been seen on the last page. 

 I should regard the following scheme as indicative of their 

 affinities : — 



Acanthodrilidae. 



Cryptodrilidse. 



Deinodrilidae. 



Eudrilini. 



Hoplochmta stuarti. 



Perichaetidse. 



1 These definitions can, of course, only be regarded as a preliminary 

 attempt. I m;ike no serious effort to decide which arc i^rohably of family 

 value and which distinguish the group. 



