THE LIMBS OF LIZARDS 141 



arches and limbs is due to degeneracy is supported by 

 palseontologic evidence, which shows that the ancestral 

 orders of the Eeptilia (Cotylosauria and Theromora) 

 had well-developed limbs. Similar evidence shows 

 that the Sauria and Ophidia had a common ancestor." ^ 



^ Cope, Crocodiles, Lizards, and Snakes, p. 206. 



