^^"^ ZOOGENESIS "^^"^ 



is an internal calcareous skeleton, and in which there 

 is always a perivisceral coelome. 



Any assumption that the various invertebrate phyla 

 represent steps in the development of the vertebrates 

 must rest on the flat denial of the developmental 

 truths which are so clearly evident within each of the 

 larger phyla. 



So through the application of a principle derived 

 from the careful and detailed study of the past history 

 of animal types within the phylum we reach the con- 

 clusion that the phyla themselves must have origi- 

 nated quite independently of each other from a com- 

 mon source. In other words, by the application of 

 this principle we find indubitable indications of the 

 origin of the various phyla through eogenesis. 



[2-07] 



