72 THE AMERICAN NATURALIST [Vol. LV 



discover how far recent species actually conform to the plan 

 proposed. 



Identification and description of the species of this cgllection 

 constitute the main portion of this monograph. A superficial 

 examination of the text reveals the fact that in order to apply 

 these principles to present day bryozoa, momentous and wide 

 spread changes will be necessary. Not only will genera and 

 families be broken up, but many heretofore considered widely 

 separate will be regarded as closely related and vice versa. 

 While one is startled by the number and significance of the 

 changes involved, yet the present morphologic method is so un- 

 satisfactory that this attempt to apply a unitary principle which 

 promises so to simplify classification and to lift it out of 

 chaos, should be heartily welcome. Too high praise cannot be 

 accorded the authors of this monograph for the excellence of 

 this work so full of new and stimulating ideas. 



Alice Robertson 



