ZooL.-VoL. II.] EISEN—OLIGOCHMTA. 165 



In A. colliniis this band is broad and runs in the long 

 diameter of the body. In A . ornatus and A . -pa^illifer the 

 ventral interval between setae a-a does not narrow towards 

 the male pore, while in A. collinus this distance becomes 

 less towards the male pore. There is also a slight diver- 

 gence between the setae a-a anterior of the male pore (fig. 

 119). 



Another slight difference is seen in the prostomium. In 

 A. collinus the prostomium divides somite I very deeply, 

 sometimes almost entirely, while in A. -papillifer and A. 

 ornatus the posterior prolongation of the prostomium never 

 exceeds the middle of somite I. 



As the triple nomenclature has been objected to by some, 

 it may be advisable to retain the name A . marmoratus for 

 the form without papillae, making those with papillae varieties 

 under this species. 



DIPLOCARDIN^. 

 General Remarks on Affinity. 



Michaelsen's (30) suggestion that the genus Diflocardia 

 be referred to a family of its own is, I think, a good one. 

 But I do not agree with him in regard to the distinguishing 

 feature of the family. The genus Trigaster and my new 

 genus Zafotecia are the disturbing factors in a perfectly 

 satisfactory arrangement of the genera and species of this 

 family and those of BenhamincB. The question arises, 

 which character should be given more weight, the neph- 

 ridia or the calciferous diverticles? Whichever is adopted, 

 we meet with difficulties. On the whole, I think that in 

 this instance the calciferous diverticles are of more syste- 

 matic importance than the nephridia. Accordingly, I place 

 in this family the genera Trigaster and Zafotecia. The 

 latter genus is created for a species with meganephridia 

 and without calciferous diverticles. To join this species 

 with Diplocardia is, according to present ideas, impossible. 



