postf rental postorbltol ^ 



frontal 



rietol 



prefrontal 

 nasol 



septomoxilla 



premaxillo 



' ectopterygold^\'^-;^^pterygoic 



lacrimal canal epiphysis- 



quadrate 

 quadratojugal 



dentory 



supraangular 

 articular 



retroarticular 

 process 



angular 



B 



Meckelian groove dentory 



articular 



angular prearticular 



prema 



xillo 



Figure 4-7. 



C, dorsal view 



paroccipitol process of opisttiotic^ 



Skull and mandible of Sphenodon. A, loterol view; B, medial view of mandible; 

 of skull; D, ventral view of skull. 



|ugal 



quadrate 

 intercolare 



70 • HEAD SKELETON OF OTHER TETRAPODS AND CHOANATES 



