PROFESSOR OWEN'S OBSERVATIONS ON THE DODO. 335 



1 1'. Orbital plate of frontal. 



12. Post-frontals. 



13. Vomer. 



14. Pre-frontal. 



15. Nasals (in fig. 5 the figures indicate their articular notches in the frontal 



bone) . 

 18. (Fig. 6) .Ethmoidal cavities for organ of smell. 



20. Palatines. 



21. Maxillary. 



22. Premaxillary. 



23. Pterygoid. 



26. Malar. 



27. Zygomatic (homologue of squamo-temporal). 



28. Tympanic. 

 73. Lachrymal. 



Fig. 7. Portion of os tympanicum of Dinornis giganteus. 

 Fig. 8. Os tympanicum of Struthio camelus. 

 Fig. 9. Os tympanicum oi Apteryx australis. 



a. Anterior or orbital process. 



b. External or zygomatic process. 



c. Inferior or mandibular articular surface. 



PLATE XL. 



Fig. 1. Side view of an upper or anterior cervical vertebra of Dinornis ingens. 



2. Front view of the same vertebra. 



3. Upper view of the same vertebra. 



4. Side view of an upper or anterior cervical vertebra of Dinornis giganteus. 



5. Upper view of the same vertebra. 



a. Anterior articular surface of the body, 



n. Neural canal. 



pi. Pleurapophysis, or anchylosed cervical rib. 



s. Rudiment of spinous process. 



V. Canal for vertebral artery. 



z. Anterior zygapophysis, or oblique or articular process. 

 z'. Posterior zygapophysis. 



PLATE XLL 



Fig. 1 . Side view of an inferior cervical vertebra of Dinornis giganteus. 

 2. Front view of the same vertebra. 



VOL. III. PART IV. 2 z 



