PLATE XXVIII 



SKULL OF TYPE OF TRICERATOPS SERRATUS MARSH. 



(See p. 122.) 

 Plate prepared under the direction of Marsh 

 Type specimen. No. 1823, Yale University Museum. Superior view. 



ep, epoccipital. 

 ej, epijugal. 

 /, frontal. 

 j, jugal. 

 rax, maxillary. 

 nas, nasal. 



nh, surface for articulation of nasal horn core. 

 One-fourth natural size. 



pa, parietal. 



pf, postfrontal. 



prf, prefrontal. 



pmx, premaxillary 



r, rostral. 



sq, squamosal. 



soh, supraorbital horn core. 



254 



