Xl DESCRIPTION OF THE PLATES. 
Fig. 8. Nautilus Archiachianus. Fig. 13. Hamites armatus. 
9. Serpula annulata. 14. Fragment of a Crustacean. 
10. Dentalium difforme. 15. Ammonites Milletianus. 
11. Scaphites zqualis. 16. Turrilites triplicatus. 
12. Hamites angustus. 17. —— Scheuchzerianus. 
Tas. XXX. 
Figs. 1 & 2. Teeth of the Ptychodus latissimus. 
3. A tooth of the Ptychodus paucisulcatus. 
4 & 5. Nascent or incomplete teeth of a Ptychodus. 
6. A tooth of the Ptychodus mammillaris. 
7 & 8. Teeth of the Ptychodus decurrens. 
9. A tooth of the Ptychodus polygyrus. 
10. A tooth of the Ptychodus altior. 
11 & 12. Teeth of the Acrodus [hngworthi. 
13. A tooth of the Acrodus cretaceus. 
14. A group of teeth of the Gyrodus angustus. 
15. A series of teeth of the Gyrodus eretaceus. 
16. A group of teeth of the Phacodus punctatus. 
17. A tooth of the Corax maximus. 
18. A tooth of the Corax falcatus. 
19. A tooth of the Lamna acuminata. 
20. ? Teeth of a species of Enchodus. 
21 & 21a,b,c,d. Teeth of the Saurocephalus lanciformis. 
22. A tooth of the Polyptychodon interruptus. 
23. Portion of a larger tooth of Polyptychodon interruptus. 
24. A tooth of the Oxyrhina Mantelli. 
25 & 25a, b, c. Teeth of the Otodus appendiculatus. 
26. A tooth of the Lamna acuminata. 
27. Portion of jaw and teeth of the Enchodus halocyon. 
28 & 29. Palatine teeth of the Saurodon leanus. 
30. Teeth of the Notidanus microdon. 
31. Portion of jaw and teeth of the Tomognathus leiodus. 
32. Teeth of the Odontaspis rhaphiodon. 
33. Coprolites of a Macropoma. 
34. Teeth of the Lamna acuminata. 
35. Teeth of a Squaloid fish. 
