PLATE IX. 



Figure 1. Trochocyathus Nariensis, Duncan. An oblique view, natural size. 

 3. Septa and pali, magnified. 



3. A transverse section of a large specimeUj sHghtly magnified. 



4. The septa, obliquely seen, magnified. 



5. The costse and epitheca. 



6. The costse, magnified. 



7. Oblique view of costse at the margin, magnified. 



8. The base, natural size. 



9. The costse and epitheca of a large specimen, slightly magnified. 



10. Side view of a tall, old specimen, natural size. 



11. Its base. 



12. A variety of the species. 



13. The septa and pali, magnified. 



14. Trochocyathus cyclolitoides, Milne Edwards and Jules Haime. The coral, side view, 



natural size. 



15. The calice, natural size. 



16. The pali and septa, magnified. 



17. The costae near the calice, magnified. 



18. A part of the base, magnified. 



19. Cyclolites orientalis, Duncan. Calice, slightly enlarged. 



20. The septa and their filiform ends, magnified. 



21 . Septa near the margin, magnified. 



