PLATE II. 



ODONTORNTTHES. 

 Teeth and Skull of Hespeeornis eegalis Marsh. 



All Figures Natural Size, except 2 and 3. Page. 



Fig. 1. — Inferior surface of premaxillary and maxillary bones, — 8 



t — Tooth in maxillary. 



Fig. 2. — Tooth ; from lower jaw, lateral view, seen from the left ; magnified eight diameters, _ - 13 



Fig. 3. — Tooth; from maxillary, lateral view, seen from the right ; magnified eight diameters,. 13 

 a — Young tooth, showing mode of development. 



Fig. 4. — Base of skull ; posterior view. Top of cranium broken away, 6 



bp — Basi-pterygoid process. 

 fm — Foramen magnum. 



Fig. 5. — Base of skull ; seen from below, . . . 6 



Fig. 6. — Left quadrate bone ; inner view, - . - . . 6 



Qa — Superior view, showing undivided articulation. 

 6b — Posterior view. 

 6c — Inferior view. 



Fig. 7. — Posterior part of right pterygoid bone ; inferior view, .- 6 



la — Posterior view, showing concave articulation for quadrate. 

 lb — Superior view. 



Fig. 8. — Right vomer ; inferior view, 7 



8a — Superior view. 



Fig. 9. — Right palatine bone ; seen from above, _ 7 



Fig. 10. — Left lachrymal ; posterior view, . . . 1 



Fig. 11. — Right lower jaw; anterior part, with inner wall of groove removed, showing rudi- 

 mentary sockets for the teeth. (Compare Plate I, fig. 3,) 13 



Fig. 12. — Basi-hyal bone ; lateral view, seen from the right. 

 12a — Superior view. 

 126 — Posterior view. 



