Ancestral Elasmobranch. 



(TABLE III) 



Cladoselache. 

 , Acanthodian. 



Squaloraja. 



phibian. 



PAL/EO- 

 ZOIC. 



MESO- 



ZOIC. 



C>ENO- 

 ZOIC. 



Q. a. q: 



O 



Pig- 103. — Scheme suggesting the interrelationships of Sharks, Chimaeroids, 

 and Lung-fishes, 



98 



