EXPLANATION OF THE PLATES. 



Fig. 



1. Astarte. 



2. Venericardia. 



3. Trigonia. 



4. Plicatula. 



5. Placuna. 



6. Spondylus. 



7. Venus. 



8. Isocardia. 



9. Crassatella. 

 10. Erycina. 



PLATE VIII. 



Fig. 



11. Donax. 



12. Cardium. 

 13 Cytberea. 



14. Cyrena. 



15. Lucina. 



16. Tellina. 



17. Area. 



18. Nucula. 



19. Pectunculus. 



20. Cucullaea. 



Fig. 



21. Perna. 



22. Crenatula. 



23. Inoceramus. 



24. Calceola. 



25. Pholas. 



26. Balanus. 



27. Coronula. 



28. Anatifa. 



29. Trigonellites, 



PLATE IX. 



Fig. Fig. 



1. The base of the lily encrinus, 8. Bivalve shell. 



or encrinites inoniliformis. 9. Internal part of the valve of 



2. Univalve shell. a species of productus. 



3. The base of the cap encrinite of 10. Tubipora anastomosans,p. 75. 



Derbyshire, Lancashire, &c. 11. Astraea in chalcedony. 



4. Trochite, or encrinital vertebra. 12. Frondescent millepore. 



5. The straight encrinite. 13. Bottle encrinite. 



6. Entrochite, or part of an encri- 14. Stagshorn encrinite. 



nital spine. 15. Clove encrinite. 



7. The base of the turban encrinite. 16. Head of a pentacrinite. 



PLATE X. 



Fig. Fig. 



1. Dudley fossil, or trilobite. 7 



2. Oniscus praegustator. 8. 



3. Part of a jaw from the Stones- 



field slate. 9. 



4. Stylina, simple. 



5. Stylina, compound. 10. 



6. One of the five triangular sec- 



tions into which the crust 



of the echinus is separable. 1 1 . 



Pentamerus. 



Ordinary fossil tooth of the ele- 

 phant. 



Fossil tooth of the elephant, the 

 plates winding and continued. 



Fossil tooth of the ' elephant, 

 the plates of extraordinary 

 thickness. 



Alveolites incrustans. 



z z. 



