PLATE VIII. 



Figure 1. Leptoria hydnophoroidea, Duncan. The corallum, natural size. 



2. A serieSj magnified. 



3. Elliptoseris aperta^ Duncan. The corallunij natural size. 



4. Septa and pali, magnified. 



5. A side of a septum, magnified. 



6. A side of a septum and some of the pali, magnified. 



1. Stephanophyllia IndicAj Duncan. The corallum, natural size, side view. 



8. The corallum from above, natural size. 



9. The calicular surface, highly magnified. 



10. The edge with trabecular septa, magnified. 



11. Trochosmilia varicosa, Keuss. The corallum, natural size.^ 



