THE SKELETON IN REPTILES. THE SKULL. 



279 



and in them too the quadratojugal is absent. Separate nasal 

 bones do not occur in any living Chelonia. 



The vomers are generally paired as in Squamata, some- 

 times unpaired as in Chelonia. 



FIG. 51. DOKSAL (TO THE LEFT) AND VENTRAL (TO THE RIGHT) VIEWS OF 

 THE SKULL OF THE COMMON SNAKE (Tropidinotus natrix). (After PARKER.) 



1. premaxillae (fused). 



2. anterior nares. 



3. nasal. 



4. prefrontal. 



5. frontal. 



6. parietal. 



7. maxilla. 



8. transpalatine. 



9. palatine. 



10. pterygoid. 



11. pro-otic. 



12. exoccipital. 



13. supra-occipital. 



14. opisthotic. 



15. epi-otic. 



16. quadrate. 



17. parasphenoid. 



18. basisphenoid. 



19. basi-occipital. 



20. occipital condyle. 



21. splenial. 



22. dentary. 



23. angular. 



24. articular. 



25. supra-angular. 



26. coronoid. 



27. vomer. 



28. squamosal. 



IX, X foramina for the ninth 



and tenth cranial nerves. 



