74 FLATWORMS, ROUNDWORMS, AND ROTIFERS 



Branch VI — Trochelminthes. 

 Class — Rotifera. 



Order — Bdelloida. 

 Type of Order. 



Rotifer species — Wheel animalcule. 

 Branch VII — Molluscoidea. 

 Class — Brachiopoda. 

 Order — Articulata. 

 Types of Order. 

 Various species. 



