PLATE XIII 



A. Skull of TRICERATOPS HORRIDUS, No. 12,003 Field Museum of 



Natural History, 1/12 natural size. 

 Courtesy of the Field Museum of Natural History. 



B. Skull of TRICERATOPS HORRIDUS, No. P271 South Dakota State School 



of Mines, 1/12 natural size. 

 Courtesy of the South Dakota State School of Mines. 



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