PLATE II. 



CORALS FROM THE CHALK. 



Fie. 



::l 



^ Various shapes of the corallura of Diblasus Gravensis, Lonsdale. (P. 14.) 



10. 

 11. 



'■1 



6. >-The costse, magnified. 



9.J 



5. The pecidiar appearance of tolerably well preserved calices, induced by fossilization, 



magnified. 

 8. The method of gemmation, and the appearance of a large calice with the septa 



worn out of it, magnified. 



