460 



TMK KVOLL'TION OF THE METAZOA 



Herewith we have also reached a welcome simplification 

 of the whole animal system and of the scheme of the gene- 

 alogical tree. This simplification can be clearly seen if we 

 compare our scheme with other schemes which are now 

 usually proposed. This simplification is purely a side result 

 of our research and it was not explicitly intended. 



A List of the Phyla and Classes of Eumetazoa 



PHYLUM 



I. Ameria (15) 



CLASSES 



TURBELLARIA (T) 



Cnidaria (Cn) 

 Ctenophora (Cph) 

 Trematoda (Tz) 

 Cestoda (C) 

 Nemertinea (Nt) 

 Rotatoria (Rz) 

 Gastrotricha (G) 



KiNORHYNCHA (K) 



Entoprocta (En) 

 Nematoda (N) 

 Nematomorpha (Nph) 

 Priapulida (Pz) 

 Acanthocephala (Ac) 

 Mollusc A (M) 



Annelida (Ann) 



POLYCHAETA (Pch) 



Clitellata (CI) 



ECHIUROIDA (En) 



IL Polymeria (8) 



Onychophora (On) 

 Crustacea (Cr) 

 Arthropoda (Arth) Chelicerata (Ch) 

 Myriapoda (My) 

 In sect a (I) 



