PLATE IX. 



CORALS FROM THE RED CHALK OF HUNSTANTOI^. 

 IG. 



1. A variety of Microbaaa coronafa, Goldfuss. Natural size. (P. :24.) 



2. The usual appearance presented by the worn specimens of Podospris mumiuiliformis. 



Duncan. (P. 25.) 



\ Tlie calice, magnified. 



5.. 



6. A specimen with a large base. 



4. A natural section (longitudinal) showing the synapticulse, magnified. 



7. A specimen showing a convex calice, the costse and synapticulae, magnified. 

 10. A specimen with epitheca, magnified. 

 11.' 



, Natural size 

 12. 



13. An irregularly shaped corallum. 



14. Its base, magnified. 



9. The side view, magnified. 



15. A short specimen. 



8. A magnified view of it, showing the synapticulse. 



16. The corallum of PoJoseris elongata, Duncan. (P. 26.) 



17. Its costae, magnified. 



18. The corallum of Cydolites pQlymorpha, Goldfuss. (P. 34.) 



