218 THE VERTEBRATE SKELETON. 



hypoplastron of its side. The hyoplastra, hypoplastra and 



FIG. 37. THE PLASTRON OF A GREEN TURTLE (Chelone midas). 

 xf. (Camb. Mus.) 



1. epiplastron (clavicle). 4. hypoplastron. 



2. entoplastron (interclavicle). 5. xiphiplastron. 



3. hyoplastron. 



xiphiplastra are homologous with the abdominal ribs of 

 Crocodiles. 



II. ENDOSKELETOK 

 1. THE AXIAL SKELETON. 



The axial skeleton includes the vertebral column, the ribs, 

 and the skull. 



