PLATE VII. 



LIASSIC CORALS FROM BKOCASTLK. 



Fig. 



1. Isastroea Sinemuriensis, E. de From. (P. 30.) 



2. The upper part of its corallum. 



3. The cahces slightly magnified to show the marginal gemmation. 



4. Another view. 



5.] 



P r Cahces, magnified. 



7. Septa, magnified. 



8. A corallum with larger calices than is usual. 



9. Calices, magnified. 



10. Thecosmilia Michelini, Terquem et Piette. (P. 14.) A large variety. 



11. Its calice. 



12. A corallum bifurcating. 



13. Its calice, magnified. 



14. Monflivaltia polymorpha, Terquem et Piette. (1^ S.) A fractured corallum. 

 lo. A transverse section, magnified. 



