U. S. GEOLOGICAL SURVEY 



BULLETIN 612 PLATE XI 



I 



A. A HORNED TOAD (^PHRYNOSOMA CORNUTUM). 



A modern lizard about 3 inches long that is armed like some of the ancient dinosaurs. Horned toads are dis 

 tributed generally over western North America and are especially abundant on the dry sandy plains. 



-^ J 



-.^'5' 



**■■■■■ 4 



.., X 



* 





-*^"S.^.K^»' --?-> 



B, THE LAST OF THE DINOSAURS. 



ThU restoration illustrates the appearance of Triceratops, showing the great bony frill over the reptile's neck. 



From painting by C. R. Kn.ght, made under the direction of J. B. Hatcher. 



