The Tetrapoda: Amphibia, Reptiles, Birds 593 



Rather, it is the lobe-finned crossopterygians (Fig. 190) that appear 

 to be the ancestral forms of the amphibians. From their fossil remains, 

 it is certain that they had limbs capable of supporting the body and the 

 potentialities of developing into good land appendages. Judging from 



Fig. 199 



Fig. 200 



Fig. 199. — Periophthalmus, the mudskipping goby. (Courtesy New York 

 Zoological Society.) 



Fig. 200. — Protopterus, the African lungfish. (Courtesy New York Zoological 

 Society.) 



