TABLE OF CONTENTS 



Page 



Introduction 7 



The Nasal Capsules of the Urodela 8 



Amblystoma punctatum 8 



Salamandra maculata 14 



Triton cristatus 17 



Diemictylus viridescens 19 



Cryptobranchus alleghaniensis 21 



Spelerpes bilineatus 25 



Plethodon erythronotus 27 



Necturus maculatus 28 



Amphiuma means 31 



The Nasal Capsule of the Gymnophiona 35 



Epicrium glutinosum 35 



Comparison of the Nasal Capsules in the Urodela and Gymnophiona . 40 



The Nasal Capsules of the Anura 49 



Pipa americana 49 



Bufo americana 51 



Hyla pickeringii 54 



Rana viridescens 55 



Comparison of the Nasal Capsules in the Anura 58 



Conclusions Based on this Study 60 



Phylogeny of the Nasal Capsule on Amphibia 60 



Classification of the Amphibia 63 



Amphibian Ancestry 65 



Bibliography 68 



Explanation of Plates 71 



