Ancestral Elasmobranch. 



(TABLE III) 



Cladoselache. 

 Acanthodian. 



PAL/€:0- 

 ZOIC. 



ualoraja. 



phibian. 



MESO- 



ZOIC. 



C/£NO- 

 ZOIC. 





c 



DC 



-a 

 c o 



as -C 



Q. 



■D O 



Q- 0. 



CS 



o 



b 



Fig. 103. — Scheme suggesting the interrelationships of Sharks, Chimseroids, 

 and Lung-fishes. 



98 



