PL/ I I MX. 



Fig. 1. Lower teeth. Natural size. 



Fig. 2. Upper teeth. Natural size. 



Fig. 3. Atlas, anterior aspect. 



Fig. 4. Atlas, posterior aspect. 



Fig. 5. Axis, anterior aspect. 



Fig. 6. Axis, posterior aspect. 



Fig. 7. Third cervical vertebra, anterior aspect. 



Fig. 8. Third cervical vertebra, posterior aspect. 



Fig. 9. Fourth cervical vertebra, anterior aspect. 



Fig. 10. Fourth cervical vertebra, post rior aspect. 



Fig. 11. Fifth cervical vertebra, anterior aspect. 



Fig. 12. Fifth cervical vertebra, posterior aspect. 



Fig. 13. Sixth and seventh cervical vertebra* in the 



Figures of vertebrae about seven-tenths natural size. 



