CLASSIFICATION OF THIS TUEKIODONT1A. 



Text-figure 21. 



71 



Series of drawings of the right lateral aspect of Pelycosaur skulls, 

 reduced to the same length. 

 A. Varanosaurus acutirostris Broili, restored from the type-skull in Munich, partly 

 after Broili. B. Deiopeus leplocephalus Cope, restored from the type-skull 

 in the American Museum. C. Sphenacodon fero.v Marsh, after Williston. 

 L). Dimetrodon ffic/as Case, from a photograph published by Case. 



