H 



n 



-5"fo-i 



PJ.ATYHELMINTHES 



6M 



CXELENTERATA 





Note: — Classes which are entirely extinct are 

 represented hy name only ; those which consist 

 of minute or microscopic forms have, the repre- 

 sentative enclosed in a circle. The approximate 

 degree of enlargement or reduction is indicated 

 by the small figures near each picture. 



The Phyla and Classes of Animals Ar- 

 ranged to show their Supposed Relation- 

 ships. 



Copyright, 19011, by W. P. Hay. 



