THE GASTRAEA-THEORY, ETC. 



247 



IV. — Monophyletic Stem-structure of the Animal Kingdom, 

 founded on the Gastraea- Theory and the Homology of the 

 Germ-lamellcB. 



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Vebtebbata, 

 Abthbopoda. 1 

 echinodebmata. 



MOLLUBCA. 



I 



CCELOMATI 



(Vermes with body-cavity.) 



ZOOPHTTA 



(Coelenterata.) 



Acalephse, 



Plathelminthes. 



Spongiae. 



ACCELOMI 



(Vermes without body -cavity.) 



Protascus. 



I 



Gastraea radialis 



(sedens). 



Prothelmis, 



I 

 Gastraea bilateralis 

 (repens). 



Gasteaea. 

 (Ontogenesis : Gastrula.) 



Planaeada 

 (Ontogenesis : Planula.) 



Protozoa. 



Acinetse. 





s a s-^ 



a. 5 



to ..-< 



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Ciliata. 



Synamoebae 

 (Ontogenesis : Morula.) 



Gregarinae 



Infusoria. 

 I 



Amcebina. 



Amceb^. 

 (Ontogenesis: Ovulum.) 



MONEEA. 



(Ontogenesis : Monerula.) 



? ? ? 



I I I 

 Monera. 



