MUTATIONS OF WAAGEN 



139 



important in the whole history of biology. It is that certain 

 new characters arise definitely and continuously, and, as 

 Osborn has subsequently shown, ^ adaptively. This law of the 



A. MACROCEPHALUS 



Zone des 

 A. ASPIOOIDES 



Zone der 

 TERDIGONA 



Zone des 

 A, PARKINSONI 



Zone .des 

 A. HUMPHRIESIANUS 



A, MAMERTENSIS 



A. SUBCOSTARIUS 



A. LATILOBATUS 



A, SUBRADIATUS 



COLLECTIVART- A. SUBRADIATUS 

 Fig. 35. Continuous Character Changes Known as the Mutations of Waagen. 



Successive geologic mutations of A mmonilcs siihradialus, drawn and rearranged from the 

 original plates published by Waagen in i86q, showing his type series of the contin- 

 uous character changes Icnown as the Mutations of Waagen. 



1 Osborn, Henry Fairfield, 1912.1. 



