Fic. 
iS Cowon 
Sz ON 
Soe 
10. 
LA. 
i: 
13. 
14. 
16. 
15. 
ly: 
18. 
19) 
20. 
21. 
PLATE VI. 
CORALS FROM THE CHALK. 
The corallum of Onchotrochus serpentinus, Duncan. (P. 4.) 
The calicular end of the corallum, magnified. 
The corallum of a small specimen. 
The coste, magnified. 
The corallum of Parasmilia granulata, Duncan. (P. 13.) 
The cost, magnified. 
The calice, magnified. 
The peduncle and its coste, magnified. 
A longitudinal section of the corallum of Zrochosmilia (celosmilia) granulata, 
Duncan, showing the wavy inner ends of the septa, and the scanty 
endotheca. 
The corallum of a Caryophyllia, showing irregular growth. 
The calice, magnified, showing a distorted arrangement of the septa. 
Longitudinal sections of Parasmilia centralis, showing the large columella and the 
scanty endotheca. 
A corallum of a young Parasmilia centralis, variety Mantel. (P. 12.) 
A younger specimen. 
The costa, magnified. 
A portion of the calice, magnified. 
A distorted corallum of Parasmilia centralis. 
Its costee, magnified. 
