

Contents 



Li^f of Illustrations, vii 

 List of Tables, x 

 Acknowledgments, xi 

 Abstract, xii 



INTRODUCTION 1 



Historical Review, 1 

 Goals of This Study, 10 



MATERIALS AND METHODS 1 3 



Specimens, 13 

 Phylogenetic Analysis, 13 

 Basic Taxa, 14 

 The Problem of Variation, 14 

 Construction of Branching Diagrams, 16 



IGUANINE MONOPHYLY 18 



COMPARATIVE SKELETAL MORPHOLOGY 2 1 



Skull Roof, 21 

 Palate, 39 

 Braincase, 44 

 Mandible, 49 



Miscellaneous Head Skeleton, 59 

 Axial Skeleton, 69 



Pectoral Girdle and Sternal Elements, 81 

 Pelvic Gridle, 86 

 Limbs, 89 

 Osteoderms, 89 



NONSKELETAL MORPHOLOGY 92 



Arterial Circulation, 92 

 Colic Anatomy, 93 

 External Morphology, 94 



