THE DEVELOPMENT OF THE SKULL OF EMYS 



LUTARIA 



B. W. KUNKEL 



From the Anatomisches Institut, Freiburg i. B., and the Sheffield Biological 

 Laboratory of Yale University, New Haven 



THIRTY-ONE FIGURES 



CONTENTS 



Introduction 693 



General form of the skull 695 



Planum basale and chorda dorsalis 696 



Regio occipitalis 702 



Regio otica 703 



Capsula otica 706 



Interior of capsula otica 712 



Tectum posterius 719 



Crista parotica 719 



Relation of the nerves in the regio otica 720 



Regio orbito-temporalis 722 



Regio ethmoidalis 730 



Palatoquadratum and mandible 740 



Columella auris 742 



Hyoid and visceral arches 744 



Membrane bones 747 



Summary 756 



Bibliography 761 



INTRODUCTION 



Although certain parts of the chondrocranium of the chelonia 

 have already been studied to some extent, the only previous work 

 which has aimed to furnish a picture of the skull and its develop- 

 ment in its entirety has been that of Parker ('80) on the devel- 

 opment of the skull of Chelone viridis. His results are of great 

 value, but on account of imperfect methods, many details of 

 structure and development escaped him and several errors occur. 

 A preliminary account of the present work has already appeared 

 (Kunkel '11). 



693 



JOURNAL OF MOBPHOLOQT, VOL. 23, NO. 4 



