PLATE XIII. 



Figure 1. Plocophyllia Sindiana, Duncan. The corallum, natural size. 



2. CostsBj magnified. 



3. Free edge of a septum^ magnified. 



4. Styloccenia Vicaryi, J. Haime. A part of the corallum^ natural size. 



5. A worn calieej magnified. 



6. Calices, magnified. 



7. Diagram of vertical edge of calicular margins^ magnified. 



8. Cyclolites alpina. The corallumj natural size. 



9. Calicular septal edge, magnified. 



10. Dasyphyllia gemmans, Duncan. A corallite, natural size. 



11. Trochosmilia DharanensiSj Duncan. Natural size. 



