TABLE OF CONTENTS. 



Page. 



Introduction 1 



Occurrence and history 2 



History of Quarry 13 2 



Plan of work 3 



History of Quarry No. 1 24 



Plan of work 25 



Osteology of Stegosaurus _ ■. 26 



Skull 26 



Summary of cranial materials 20 



Known elements of the Stegosaurian skull 27 



Description 27 



Basioccipital 28 



Exoccipital and Paraoccipital 28 



Supraoccipital 29 



Basisphenoid and Presphenoid 30 



Alisphenoid 30 



Orbitosphenoid , 31 



Parietal 31 



Frontal 31 



Prefrontal 32 



Postfrontal 32 



Postorbital 32 



Prootic 32 



Lachrymal 33 



Supraorbitals 33 



Nasals 33 



Premaxillae . 33 



Maxillae 34 



Jugal 34 



Quadra tojugal 34 



Quadrate 35 



Squamosal 35 



Pterygoids 36 



Palatines 36 



Vomer 36 



Epipterygoid 36 



Measurements of skull 36 



Lower jaw 37 



Dentary 37 



Predentary .' 38 



Splenial 38 



Angular 38 



Surangular 38 



Articular 39 



Prearticular 39 



Coronoid 39 



Measurements of lower jaw 40 



Hyoid 40 



v 



