PLATE VI. 



CORALS FROM THE CHALK. 



Fig. 



1. The corallum of Onchotrochus serpentinus, Duncan. (P. 4.) 



i. The calicular end of the coialluni, magnified. 



3. The corallum of a small specimen. 



4. The costae, magnified. 



5. Ihe coxfAXmn o^ Parasmilia ffranuIata,Y>v\\K9.x\. (P. 13.) 

 (). The costa?, magnified. 



7. The calice, magnified. 



8. The peduncle and its costse, magnified. 



9. A longitudinal section of the corallum of Trochosniilia [cmhsmilia) (jranulata, 



Duncan, showing the wavy inner ends of the septa, and the scanty 

 endotheca. 



1 0. The corallum of a Caryoj)hyllia, showing u-regular growth. 



11 . The calice, magnified, showing a distorted arrangement of the sepia. 



12.1 Longitudinal sections of Parasmilia centralis, showing the large columella and tlic 

 13. J scanty endotheca. 



14. A corallum of a young P«ras»«7/« ee??/rff/fs, variety ^/r/w^^//;'. (P. 1.2.) 



16. A younger specimen. 



15. The costac, magnified. 



17. A portion of the calice, magnified. 



18. A distorted corallum oi Parasmilia centralis. 



20. >Its costse, magnified. 

 21. 



