196 



THE VERTEBRATE SKELETON. 



are placed far back just in front of the orbits. There is an 

 interparietal foramen, and the supratemporal fossae (fig. 32, 9) 



FIG. 32. LATERAL (BELOW) AND DORSAL (ABOVE) VIEWS or THE SKULL OF 

 AN Ichthyosaurus. (Modified from Deslongchamps.) 



1. pr em axilla. 



2. maxilla. 



3. nasal. 



4. prefrontal 1 , 



5. frontal. 



6. postfrontal 1 . 



7. anterior nares. 



8. orbit. 



9. supratemporal fossa. 



10. interparietal foramen. 



11. parietal. 



12. squamosal. 



13. supratemporal. 



14. quadrate jugal. 



15. sclerotic ring. 



16. postorbital. 



17. jugal. 



18. lachrymal. 



19. dentary. 



20. articular. 



21. angular. 



are very large, while there are no infratemporal fossae. An 

 epipterygoid occurs. The quadrate is firmly fixed to the 

 cranium, and there is a large parasphenoid. There are large 

 prefrontals, but the frontals are very small. The very numer- 

 ous teeth are large and conical, and are placed in continuous 



1 The exact position of the suture between the prefrontal and post- 

 frontal is not known. 



