postorbital 

 postfrontal 



intertemporal 



supratemporal 



septomoxilla prefrontal 



lacrimal 

 nasal 



posttemporal fenestra 



, , squamosal 



tabular ^ 



columella (stapes) 



quadrate quadratojugal 



quadrate pterygoid 



quadratojugal 



supraangulor 



coronoids 



articular 



lacrimal canal 

 (dashed lines) 



jugal 



postorbital 



intertemporal 



squamosal 



quadratojugal 



supratemporal 

 quadrate 



parasphenoid 



postparietal 



tabular 



uadrote 



orbitosphenoid 



lorol canal 



basipterygoid process 



fenestra vestibuli 



paroccipital process 

 of opisthotic 



sella turcica 

 ^exoccipital 



basioccipital 



H 



prootic 



opisthotic 



^basioccipital 

 parasphenoid fused to basisphenoid 

 carotid canal (dashed lines) 



Figure 4-26. Skull and mandible of Seymouna. A, lateral view of skull and mandible; B, dorsal 

 view; C, palatal view; D, reor view of skull; E, medial view of mandible; F, cross section of 

 orbit'osp'henoids and parasphenoid; G, lateral view of endocranium; H, medial view of posterior part 

 of right half of the endocranium, (After White, 1939, and Romer, 1955) 



90 • HEAD SKELETON OF OTHER TETRAPODS AND CHOANATES 



