EVIDENCE FROM PALEONTOLOGY 119 



Pig. 13. Skulls of Horned Dinosaurs. A, Torosaurus. B, Triceratops. 

 C, Monoclonius. D, Styracosaurus. E. Ceratops. F, Brachycera- 

 tops. These do not form a single genealogical series, merely sev- 

 eral stages in the development of the skull. (From Matthew, in 

 part). 



