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Plate VI. 



Figure 1. — Maxillary tooth of Triceratops serratus, Marsh; outer view; natural 

 size. 



Figure 2. — The same tooth; side view. 



Figure 3.— The same tooth; inner view. 



Figure 4. — The same tooth; seen from below. 



Figure 5. — Anterior cervical vertebrae of Triceratops prorsus, Marsh; side view; 

 one-eighth natural size. 



Figure 6. — The same; front view. 



a, anterior face of atlas; d, diapophysis; p, posterior face of fourth 

 vertebra; r, rib; s, neural spine of axis; s', neural spine of third 

 vertebra; s", neural spine of fourth vertebra; z r , posterior zyga- 

 pophysis. 



Figure T. — Ungual phalanx of Triceratops horridus, Marsh; front view; one- 

 fourth natural size. 



Figure 8. — The same bone ; side view. 



Figure 9. — The same ; posterior view. 



Plate VII. 



Figure 1. — Pelvis of Triceratops flabellatus, Marsh; side view; one-twelfth 



natural size. 

 Figure .2. — Pelvis of Stegosaurus stenops, Marsh; side view; one-tenth natural 

 size. 

 a, acetabulum; it, ilium; is, ischium; p, pubis; p', post-pubis. 



