EXPLANATION OF THE PLATES. 



PLATE VIII. 



Fig. F 



1. The base of the lily encrinus, 8. 



or encrinites moniliformis. 9. 



2. Univalve shell. 



.3. The base of the cap encrinite of 10. 



Derbyshire, Lancashire, &c. 11. 



4. Trochite, or encrinital vertebra. 12. 



5. The straight encrinite. 13. 



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



nital spine. 15. 



7. The base of the turban encrinite. 16. 



Bivalve shell. 



Internal part of the valve of 



a species of productus. 

 Tubipora auastomosans,p. 75. 

 Astraea in chalcedony. 

 Frondescent millepore. 

 Bottle encrinite. 

 Stagshorn encrinite. 

 Clove encrinite. 

 Head of a pentacrinite. 



PLATE X, 



Fig. 



1. Dudley fossil, or trilobite. 



2. Oniscus prsegustator. 



3. Part of a jaw from the Stones - 



field slate. 



4. Stylina, simple. 



5. Stylina, compound. 



6. One of the five triangular sec- 



tions into which the crust 

 of the echinus is separable. 



Fig. 

 7 Pentamerus. 



8. Ordinary fossil tooth of the ele- 



phant. 



9. Fossil tooth of the elephant, the 



plates winding and continued. 



10. Fossil tooth of the elephant, 



the plates of extraordinary 

 thickness. 



11, Alveolites incnistans. 



% Z. 



