THE NEW GENE;AL0GICAL TREE 



461 



III. Oligomeria (9) 



SiPUNCULIDA (S) 



Phoronida (Ph) 



POGONOPHORA (Pg) 

 ECTOPROCTA (Ep) 



Brachiopoda (Br) 

 Chaetognatha (Ch) 



ECHINODERMATA (Ech) 



Pterobranchia (Pt) 

 Enteropneusta (E) 



IV. Chordonia (10) 



A CRANIA (A) 



Tunic at a (T) 

 Agnatha (Ag) 

 Protichthya (Pi) 

 Chondrychthya (Ch) 



OSTEYCHTHYA (Oi) 



Amphibia (Am) 

 Reptilia (R) 

 AvES (Volatilia) (Av) 

 Mammalia (M) 



(42) CLASSES 



An Attempt to Unify the Animal System 



There still remain numerous suggested systems even if we 

 disregard those suggestions which are now completely anti- 

 quated or clearly aberrant. There can be, however, one only 

 truly natural system. We still have a long way to go to reach 

 this ideal solution, even if we are coming closer to this ideal. 

 We can be helped here by new discoveries of some recent 

 species which have remained unknown till now, or of some 

 corresponding fossilized remains. New facts and ideas can 



