TAB I. 



Pterodactylus Sirnus. 



Fig. 



1. Fore part of the upper jaw, left side. 



2. Ditto, right side. 



3. Ditto, front view. 



4. Ditto, upper view. 



5. Ditto, under view. 



6. Hind part of the right ramus of the lower jaw, inner side. 



7. Ditto, outer side. 



8. Ditto, under side. 



9. Ditto, upper side. 



10. Ditto, section. 



11. Occipital condyle. 



12. Basi-occipital, side view. 



13. Ditto, upper view. 



14. Atlas and axis vertebrae, front view. 



15. Ditto, side view. 



16. Ditto, back view. 



The foregoing figures are of the natural size, and from specimens 

 in the Woodwardian Museum of the University of Cambridge ; 

 they were obtained from the Upper Green-sand formation near that 

 town. 



