X ILLUSTEAITONS. 



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Pio. 6. Left quadrate and quadratojugal of Stegosaurus stenops f Marsh, lateral view 35 



7. Left squamosal of Slegosawus stenops ? Marsh, ventral view 35 



8. Right dentary of Stegosaurus ep. , internal view 37 



9. Thyrohyals of Stegosaurus sp , 40 



Ifl. Skull of Stegosaurus sp., oblique lateral view 42 



11. Tooth of Stegosaurus ungulatus Marsh, outer, inner, and top views 44 



12. Dentition of right maxillary of Stegosaurus stenops Marsh, internal view 45 



13. Atlas of Stegosaurus stenops ? Marsh, lateral, back, and front views 46 



14. Axis of Stegosaurus sp. , lateral view 47 



15. Cervical vertebra of Stegosaurus ungulatus Marsh, side and front view 48 



16. Articulated cer\dcal vertebrae of Stegosaurus stenops Marsh, ventral view 48 



17. Posterior cervical vertebra of Stegosaurus ungulatus Marsh, side and front views 49 



18. Anterior dorsal vertebra of Stegosaurus sp. , side and front views 49 



19. Anterior dorsal vertebra of Stegosaurus sp. , side and fi'ont views 50 



20. Posterior dorsal vertebra of Stegosaurus sp. , side and front views 51 



21. Dorsal vertebra of Stegosaurus ungulatus Marsh, side and front views 52 



22. Sacrum and ilia of Stegosaurus ungulatus Marsh, ventral view 54 



23. Pelvic region of Stegosaurus stenops Marsh, ventral view 55 



24. Cast of nem-al cavity in sacrum of Stegosaurus ungulatus Marsh, side, top, and sectional 



views 56 



25. Second (?) caudal vertebra of Stegosaurus ungulatus Marsh, front view 58 



26. Anterior caudal vertebra of Stegosaurus ungulatus Marsh, lateral view 58 



27. Anterior caudal vertebra of Stegosaurus ungulatus Marsh, side and front views 59 



28. Median caudal vertebra of Stegosaurus ungulatus Marsh, side and front views 60 



29. Chevrons of Stegosaurus sp. , side and posterior views 62 



30. Chevron of Stegosaurus ungulatus Marsh, back and front views 63 



31. Cervical rib of Stegosaurus stenops Marsh, internal view 63 



32. Left sternal bone of Stegosaurus sp. , superior and ventral views 65 



33. Articulated sternal bones of Stegosaurus sp. , superior view 66 



34. Left sternal bone of Trachodon annectens Marsh, superior and ventral views 66 



35. Left ulna of Stegosaurus ungulatus Marsh, side view 69 



36. Carpus of Stegosaurus sp. , front and superior views 70 



37. Right fore foot of Stegosaurus sp. , front and superior views 71 



38. Right fore foot of Stegosaurus sulcatus Marsh, superior and front views 73- 



39. Outline of proximal ends of metatarsals of Stegosaurus sulcatus Marsh 74 



40. Left fore foot of Stegosaurus stenops Marsh, palmar view ^ . 74 



■41. Unguals of Stegosaurus, top views' 76 



42. Pelvis of Stegosaurus stenops Marsh, side view - 78 



43. Left pubis of Stegosaurus ungulatus Marsh, outer view 79 



44. Right ischium of Stegosaurus ungulatus Marsh, internal view 80 



45. Comparative views of Stegosaurus femora, front views 81 



46. Left femur of Stegosaurus ungulatus Marsh, front views 82 



47. Left tibia and fibula of Stegosaurus ungulatus Marsh, front view 84 



48. Right tibia of Stegosaurus sp., distal view 85 



49. Astragalus of Stegosaurus sp. , proximal view 86 



50. Calcaneum of Stegosaurus sp. , lateral and front views 87 



51. Metatarsal of Stegosaurus ungulatus Marsh, side and front views 88 



52. Right hind foot of Stegosaurus sp. , superior view 89 



53. Vestigal metatarsal of Stegosaurus sp. , side view 89 



54. Ungual of Stegosaurus sp., front, side, and posterior views 90 



55. Gular ossicle of Stegosaurus ungulatus Marsh, superior side and inferior views 91 



56. Tubercular spine of Stegosaurus ungulatus Marsh, superior, inferior and end views 92 



57. Nuchal plate of Stegosaurus sulcatus Marsh, side and posterior views .- 92 



58. Diagram showing plates and caudal vertebrae of Stegosaurus stenops Marsh, as found 



in silm, 93 



