PLATE XL VI. 



SKULL OF TYPE OF TRICERATOPS FLABELLATUS MARSH. 



(Seep. 143.) 



Plate prepared under the direction of Hatcher. 



Type specimen, No. 1821, Yale University Museum. Palatal view. 



asl, articulating surface for lower jaw. pmx, premaxillary. 



bo, basioccipital. pt, pterygoid. 



bs, basisphenoid. q, quadrate. 



exo, exoccipital. qj, quadratojugal. 



race, median eustachian canal. . r, rostral bone. 



mx, maxillary. so, supraoccipital. 



oc, occipital condyle. sq, squamosal. 



pa, parietal. v, vomer. 



pi, palatine. X, xi, XII, cranial nerve foramina. 

 One-eighth natural size. 



290 



