orbitosphenoid 



P'°°"'^ parietal 



epiotic 

 air spaces 



supraoccipital 



)ital 



quadrate 

 epiphysis 

 basioccipital 

 ^^eustachian canal 

 basisphenoid 



pterygoic 



supraoccipital 

 posttemporol fenestra 



squamosa 



superior temporal fenestra 



prefrontal 



tA exoccipital lacrimal 



yK paroccipitai process 



jugal 



orbitosphenoid^ 

 frontal 



paroccipitai process 



quadratojuga 

 ranioquadrate fissure 



occipital condyle 



jugular foramen 



prearticular supraangular 



quadrate 

 carotid canal 

 basioccipital 

 basisphenoid 

 pterygoid 



articular 



dentary 



retroarticular process 



ong' 



ular 



supraangular ^^^jibular fenestra and fossa 



prearticular \ / articular 



Meckelion fenestra 



Figure 4-1 1 . Skull and mandible of alligator. A, medial view of right half of skull; B rear view of 

 skull C loterol view of cron.um with labial arch and quodrotoiugol removed; D. lateral v,ew of 

 mandible; E, medial view of mandible. 



74 . HEAD SKELETON OF OTHER TETRAPODS AND CHOANATES 



