PLATE XXIX. 



SKULL OF TYPE OF TRICERATOPS SERRATUS MARSH. 



(See p. 122.) 



Plate prepared under the direction of Marsh. 



Type specimen, No. 1823, Yale University Museum. Oblique front view. 



ep, epoccipital. pf, postfrontal. 



ej, epijugal. prf, prefrontal. 



/, frontal. pmx, premaxillary. 



ju, jugal. qj, quadratojugal. 



mx, maxillary. /', rostral. 



nas, nasal. qu, quadrate. 



no, nasal opening. sq, squamosal. 



o, orbit. soh, supraorbital horn core. 



pa, parietal. 



One-fourth natural size. 



256 



