178 0. C. Marsh — The gigantic Ceratopsidce. 



Plate V. 



FiauRE 1. — First caudal vertebra of Triceratops prorsus, Marsh; side view. 



Figures 2-3. — Front and back views of same vertebra. 



Figure 4. — Median caudal of same species ; side view. 



Figures 5-6. — Front and back views of same vertebra. 



Figure 7. — More distal caudal of same species; side view. 



Figures 8-9. — Front and bottom views of same vertebra. 



Figures 10-12. — Distal caudal of same species; side, front, and bottom views. 



a, anterior face of centrum ; c, face for chevron ; n, neural canal - 

 p, posterior face of centrum; r, rib; s, neural spine; z, anterior 

 zygapophysis ; z', posterior zygapophysis. 



All the figures are one-eighth natural size. 



Plate YI. 

 Figure 1 . — Right scapula and coracoid of Triceratops prorsus, Marsh ; side view.. 

 Figure 2. — Right humerus of same species ; front view. 

 Figure 3. — Left ulna of same species ; front view. 



cr, coracoid ; g, glenoid fossa ; h, head ; o, olecranon ; r, radial crest ;. 

 r', face for .radius ; s, suture ; sc, scapula. 



All the figures are one-eighth natural size. 



Plate VII. 

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

 natural size. 

 a, acetabulum ; U, ilium ; is, ischium ; p, pubis. 

 Figure 2. — Pubis of Triceratops prorsus, Marsh; side view ; one-eighth natural size.. 

 Figure 3. — The same pubis; top view. 

 Figure 4. — The same ; side view. 



a, proximal end ; b, face for ilium ; c, pubic process ; d, distal end. 



Plate YIII. 

 Figure 1. — Left femur of Triceratops prorsus, Marsh; front view. 

 Figure 2. — Left tibia of same species; front view. 

 Figure 3. — The same tibia ; distal end ; back view. 



a, astragalus; c, inner condyle; c', cnemial crest; /, face for fibula;, 

 h, head; t, great trochanter. 



All the figures are one-eighth natural size. 



Plate IX. 

 Figure 1. — Metacarpal of Triceratops prorsus, Marsh; front view; one-eighth. 



natural size. 

 Figures 2-3. — The same ; side and back views. 

 Figure 4. — Terminal phalanx of manus of Triceratops flaoellatus, Marsh ; front 



view ; one-fourth natural size. 

 Figures 5-6. — Side and back views of same. 



Figure 7. — Metatarsal of Triceratops prorsus; side view; one-eighth natural size. 

 Figures 8-9. — Front and side views of same. 



Figure 10. — Ungual phalanx of Triceratops horridus, Marsh; front view; one- 

 fourth natural size. 

 Figure 11. — The same; side view. 

 Figure 12. — The same ; posterior view. 



Plate X. 

 Figure 1. — Dermal spine of Triceratops ; side view; one-eighth natural size. 

 Figures 2-3. — Front and top views of same. 



Figure 4. — Dermal plate of Triceratops ; top view; one-eighth natural size. 

 Figure 5. — Bottom view of same. 

 Figures 6-7. — Side and end views of same. 



Figures 8-10. — Dermal plate of Triceratops ; top, bottom, and side views; one- 

 eighth natural size. 

 Figure 11. — Dermal ossification of Triceratops; side view; one-half natural size.. 

 Figure 12. — Front view of same. 



