ILLUSTRATIONS. 



PLATES. 



Facing page. 



Plate 1. Quarry, Garden Park, Fremont County, Colorado . x 136 



2. Skeleton of Stegosaurus stenops 136 



S. Outline of skeleton of Stegosaurus stenops 136 



4. Skeleton of Stegosaurus stenops, lower side 136 



5. Skull of Stegosaurus stenops, side view 136 



6. Skull of Stegosaurus stenops, top view 136 



7. Skull of Stegosaurus stenops, inferior view 136 



8. Skull of Stegosaurus stenops, longitudinal section 136 



9. Skull of Stegosaurus stenops, anterior and posterior views 136 



10. Skull and brain cast of Stegosaurus armatus, superior, inferior, and longitudinal views. . 136 



11. Portion of neck with anterior dermal plates of Stegosaurus stenops, superior view 136 



12. Series of dermal plates of Stegosaurus stenops, side view 136 



13. Dermal plate of Stegosaurus stenops, side and basal views 136 



14. Dermal plate of Stegosaurus stenops, side and basal views 136 



15. Tip of tail with spines of Stegosaurus stenops, lateral view 136 



16. Tip of tail with spines of Stegosaurus (Diracodon) stenops, lateral view 136 



17. Dermal spine of Stegosaurus stenops, lateral and anterior views 136 



18. Dermal spine of Stegosaurus sulcatus anterior, lateral, and sectional views 136 



19. Skull of Stegosaurus stenops; sacral cavity of Stegosaurus, sp 136 



20. Coracoid, humerus, ulnae, and radii of Stegosaurus 136 



21. Scapula, metacarpals, and hind foot of Stegosaurus 136 



22. Skull of Heloderrna, and dermal ossicles of Stegosaurus stenops 136 



23. Dermal plates of Stegosaurus stenops and S. sulcatus, lateral view 136 



24. Dermal plates of Stegosaurus stenops, lateral view 136 



25. Fibula, ischium, and dermal tail spines of Stegosaurus 136 



26. Scapula, coracoid, and humerus of Roplitosaurus marshi 136 



27. Dermal ossifications of Hoplitosaurus marshi _ 136 



28. Dermal plate of Hoplitosaurus marshi 136 



29. Dermal plate of Hoplitosaurus marshi, lateral and posterior views 136 



30. Dermal plate of Hoplitosaurus marshi, lateral and posterior views 136 



31. Dermal bones of unidentified dinosaurs 136 



32. Restorations of Stegosaurus ungulatus 136 



33. Restorations of Stegosaurus ungulatus 136 



34. Restorations of Stegosaurus ungulatus and S. stenops 136 



35. Restorations of Stegosaurus ungulatus and Stegosaurus . 136 



36. Restorations of Stegosaurus ungulatus. Photograph of mounted skeleton in Peabody 



Museum 136 



37. Map of "Quarry 13'' 136 



TEXT FIGURES. 



P»ge. 



Fig. 1. Section of Quarry 13 ~ . - 3 



2. Map of Quarry 13 4 



3. Skull of Stegosaurus stenops Marsh, side view 27 



4. Skull of Stegosaurus stenops? Marsh, rear view 28 



5. Skull of Stegosaurus stenopsl Marsh, rear view 29 



IX 



