DESCRIPTION OF THE PLATES. 



PLATE I. 



Fig. 1 . Part of a fossil lunated star, resembling that of Pentagonaster Semilunatus. 



2. An echinite from France. 



3. Part of a stellite, resembling Pentagonaster Regularis. 



4. A small echinite from Wiltshire, possessing many characters of C. diadema. 



5. An echinite with its attached spines, imbedded in flint. 



6. A mammillated echinite from Wiltshire. 



7. Cidaris Corollaris, a silicious cast. 



8. An echinite with its spines attached, from Stunsfield, similar to Fig. 4. 



9. A globose mammillated echinite from Oxfordshire. 



10. An echinite from Kent, with its spine. 



11. A conoiclal mammillated echinite from Kent. 



12. An echinite from Wiltshire, with a remarkable anal appendage. 



13. Another echinite from the same place. The appendage is here extended in a tre- 



lissed manner, like the markings of the next fossil. 



14. The markings of an unknown fossil, figured by Walch, and which seem to resemble 



the markings on the echinite, Fig. 13. 



15. A small stellites, approaching to S. lacertosa. 



16. Small fossil, resembling the coriaceous pentapetalous sea-star, from Baier. 

 17. 



18. 



i 



, 'Minute stellitsB from Verona. 

 20 



