TAB. IV 



Pig. 



1. Upper view of a part of the cranium of Polyptychodon interruytus ; one 



fourth the nat. size. 



2. Fragment of the alveolar part of the same cranium ; nat. size. 



3. A tooth of the same specimen, side view, nat. size ; a, ditto, opposite side ; 



b, ditto, section of fang, showing pulp-cavity. 



4. Basal half of a tooth of Pterodactylus simus ; nat. size. 



5. Unciform ? carpal bone of Pterodactylus Sedgwickii, proximal ? surface. 



6. Ditto, distal? surface. 



7. Scapho-cuneiform ? carpal bone of Pterodactylus Sedgivickii, proximal ? 



surface. 



8. Ditto, distal ? surface. 



9. Ditto, side view. 



10. Ditto, end view. 



11. Ungual phalanx of Pterodactylus Sedgwickii, side view. 



12. Ditto, upper view. 



