24 



THE OSTEOLOGY OF THE REPTH^ES 



the snakes (Fig. 59) and amphisbaenian lizards; in the mosasaurs 

 (Fig. 57) their outer extremity extends to the outer extremity of the 



Fig. 10. A, B, Edaphosaurus. Theromorph skull: occipital complex, from without and 

 within, natural size; C, genus indet. basisphenoid, from below; D, the same from above; 

 E, the same from side, natural size. F, G, H, Eryops. Temnospondyl skull: basicranial 

 bones, longitudinal and transverse sections; so, supraoccipital; po, paroccipital; eo, 

 exoccipital; bo, basioccipital; pc, prootic; bs, basisphenoid; ps, parasphenoid; st, stapes; 

 ep, epipterygoid. 



paroccipital, articulating with the so-called supratemporals, or, as 

 the author believes, the tabulars. 



Posto plies (as, al), (laterosphenoids, otosphenoids, " alisphenoids"). 

 Variable and yet doubtful bones in the reptiles, apparently not 



