PLATE V. 



CORALS FROM THE CHALK. 



F]G. 



1. The corallum of Trochosmilia {Coelosmilia) cylindrica, Duncan. (P 10.) 



2. A fractured portion of the corallum, showing the endothecal dissepiments and 



the septa. 



3. Costae, magnified. 



4. The corallum of Parastnilia monilis, Duncan. (P. 12.) 



5. A magnified view of the costse on the peduncle. 



6. A magnified view of the costae high up. 



7. The costae on the body of the corallum, magnified. 



8.1 The coraUum of Parasmilia centralis, Ed. and H., sub-species Gravesana. 

 9.1 (P. 12.) 



\ The corallum of Parasmilia centralis, showing the typical costal arrangement, 

 lo. J 



The costae of the corallum, magnified. 



