PLATE XV. 



CORALS FROM THE LOWER GREENSAND. 



Fig. 



2. /Corallites of Troehosmilia Meyeri, Duncan. (P. 41.) 



3. J 



^' ^Calices, magnified. 



5. (■ ^ 



6. Variety with broad base. 



7. Its calice, magnified. 



8. Part of the corallum of Brachycyathm Orbignyanus, Ed. and H. (P. 40.) 



9. Longitudinal view of the septa and pah, magnified. The notch indicates the 



commencement of pali attached to tertiary septa. 



10. Corallum (cast) of Isasfraa Morrisii, Duncan. (P. 42.) 



11. The cast, magnified. 



12. Impression, magnified. 



13. The corallum of Turbinoseris De-Promenteli, Duncan. (P. 43.) 



14. A variety. 



15. Synapticulse and septa, magnified. 



16. Calice, size of life. 



17. Costae, magnified. 



18. The unusual appearance of septa endmg in intercostal spaces, magnified. 



