orbitosphenoid 



frontal 



sclerotic eye ring 



mesethmoid 

 prefrontal 



nasal 



premaxilla 



parietal 

 squamosal 



dentary 



supraangular 



labial arch 



i quadratojugol 



angular cerotobranchiol I 



supraoccipitol 



exoccipitol 

 opistfiotic 



pes in fenestra vestibuli 

 proofic 

 eustachian canal 



epibronchiol I 



nasal 



prefrontal 



prefrontal-// 



|uga 



mesethmoid 



parasphenoid 

 parabasal cana 

 orbitosphenoid 



quadratojugol 



quadrate , 



quodrote- 



porosphenoid covering 



basisphenoid- , 



squamosal „ u i i 



^ parabasal canals 



exoccipitol \Xy 



X,XU 

 parietal hypoglossal foramen'' 



occipital foramen^ 



^ foramen magnum 



supraoccipitol 



exoccipitol 

 basioccipital 



supraoccipitol 



Figure 4-13. Head skeleton of the chick (shortly after hatching). A, lateral view; B, dorsal view; 

 C, ventral view. 



OTHER TETRAPODS • 77 



