THE HISTORY OF ANIMAL LIFE 



405 



mate fossils is found, including ape-like forms and one, Pithecan- 

 thropus erecttis, which was either a man-like ape or an ape-like 



Fig. 224. — Archxopteryx, an extinct primitive bird. The original fossil is in a Berlin 

 museum. (After Vialleton: Elements de Morphologie des Vertebres, published by 

 C. Doin et Cie, Paris. Original figure by Zittel.) 



man, usually regarded as the latter. In the next era, the Quaternary, 

 are found the remains of a number of primitive human types, one 



