supraciliary Pronto' 

 prefrontal ^ ^'^^ 



postorbital 



prootic 



opisthotic 

 squamosal 



quadrate 

 ,quadratojugai 



quadrate 



squamosal 



fused parietals 



suprooccrpital 

 exoccipital 



premaxilla 



D maxilla 



prefrontal 



lacrimal / , r ^ , > 



fused frontals 



ectopterygoid 



fused pterygoids quadratojugal 



ectopterygoid 



palatine palatine fenestra 



premaxilla 



incisive foramen 



jugular foramen 

 hypoglossal canals 



epiphysis on 

 occipital condyle 



eustachian canal 

 basioccipital 



carotid canal 

 cranioquadrate 

 fissure 



supraciliary 



internal nasal opening 

 Figure 4-10. Skull of the alligator. A, lateral view; B, dorsal view; C, ventral view. 



quadrate 



OTHER TETRAPODS • 73 



