PLATE LXI. 



Cretaceous Dinosaurs. — Predentata. 



Ceuatopsid.i:. 



Page. 



Fig. 1. Anterior part of skull of Triceratops prorsus Marsh; side view 209 



Fig. 2. Front view of same 209 



Fig. 3. The same ; seen from below 209 



h', nasal horn core; it, nasal; va, narial aperture; pm, premaxillary ; r, 

 rostral bone. 



Fig. 4. Predentary bone of same individual; side view 211 



Fig. 5. Top view of same specimen 211 



Fig. 6. Bottom view of same 211 



a, anterior end; 6, upper border; d, groove for dentary; s, symphysis. 

 All the above figures are one-eighth natural size. 

 Fig. 7. Cast of brain cavity of Triceratope aerratus Marsh; side view; one-half 



natural size 211 



c, cerebral hemispheres; eft, cerebellum; in, medulla; ol, olfactory lobe; on, 

 optic nerve; p, pituitary body; V, fifth nerve: X, XI, tenth and elev 

 enth nerves; XII, twelfth nerve. 

 Fig. 8. Skull of Triceratops prorsus; seen from m front ; one-twentieth natural 



size 210 



, dentary; e, epoccipital; h, horn core; h , nasal horn core; p, parietal; 

 pd, predentary; q, quadrate. 



Fig. 9. Maxillary tooth of Triceratope serratus; side view; natural size 211 



Fig. 10. The same tooth; inner view; natural size 211 



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