7 6 



AMERICAN PERMIAN VERTEBRATES 



humerus. The skull, pectoral girdle, and limbs have all been 

 assumed to be like those of Dimetrodon, which have been used in 

 the restorations. But I am very skeptical indeed of the legitimacy 



Fig. 23. — Naosaurus, or new 

 genus. Right femur, tibia, and fibula, 

 ventral side, two-fifths natural size. 



Fig. 24. — Dimetrodon incisivus 

 Cope. Right femur, tibia, and fibula, 

 ventral side, two-fifths natural size. 



of this assumption. I believe that when the skeleton is fully 

 known it will prove to be very unlike that of Dimetrodon. Case 

 has been inclined to the belief that Naosaurus is a synonym of 



