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. pa, parietal. 



ej, epijugal. pf, postfrontal. 



/, frontal. prf, prefrontal. 



j, jugal. pmx, premaxillary 



mx, maxillary. /', rostral. 



nas, nasal. sq, squamosal. 



nh, surface for articulation of nasal horn core. soh, supraorbital horn core. 

 One-fourth natural size. 



254 



