PLATE XXXVII. 



SKULL REFERRED BY MARSH TO TRICERATOPS SULCATUS MARSH. 



(See p. 134.) 



Plate, prepared under the direction of Marsh. 



Specimens Nos. 1203, 1206-1210, U. S. National Museum. 



Fig. 1. Posterior view with crest broken away, showing occiput. 

 Fig. 2. Anterior view. 



bo, basioccipital. oc, occipital condyle. 



exo, exoccipital. • pff, postfrontal fontanelle. 



fin, foramen magnum. so, supraoccipitai. 



o, orbit. soh, supraorbital horn core. 



One-eighth natural size. 



272 



