184 MANUAL OF ZOOLOGY, 



ever, the sexes are united in the same individual, and there is 

 no anal aperture ; whereas in the Roiifera the sexes are dis- 

 tinct, and there is a distinct anus. To the true Artkropoda, as 

 already pointed out, the Rotifera shows some points of affinity, 

 but these are hardly sufficiently numerous or decided to war- 

 rant the removal of the group from the Annuloida to the 

 Annulosa. 



