INTRODUCTION 



Surrounding orbits 



Temporal bones 



Mandible 



8. Lacrimals (la) 



9. Prefrontals (pr) 



10. Postfrontals (pf) 



11. Postorbitals (po) 



12. Jugals (j) 



13. Intertemporals (it) 



14. Supratemporals (st) 



15. Tabulars (/) 



16. Squamosals (sq) 



17. Quadratojugals (qj) 



18. Dentaries (d) 



19. Coronoids (cor) 



20. Splenials {sp) 



21. Postsplenials (psp) 



22. Angulars (an) 



23. Prearticulars (pa) 



24. Surangulars (sa) 



25. Articulars (art) 



26. Prevomers (pv) 



27. Palatines (pi) 



28. Pterygoids (pi) 



29. Ectopterygoids (ec) 



30. Quadrates (^m) Articulation of mandible 



31. Exoccipitals (eo) 



32. Paroccipitals (poc) 



33. Prootics (pc) 



34. Postoptics (al) \ Cranial bones 



35. Stapes (sip) 



36. Epipterygoids (ep) 



37. Ethmoids (se) 



Palatal bones, dentigerous 



AA. Unpaired Bones 



38. Parasphenoid (ps) Palate 



39. Supraoccipital (so) 



40. Basioccipital (bo) |. Cranial bones 



41. Basisphenoid (bs) 



The Primitive Postcranial Skeleton 



A. Membrane Bones, Exoskeletal 



1. Sclerotic plates in orbits. 



2. Paired clavicles, cleithra and elongate interclavicle 



3. Dermal plates or scutes. 



