PLATE X. 



Pigure 1. Reussastrjea grandiSj Duncan. A calice^ magnified. 



2. Calices, magnified. 



3. CostsBj magnified. 



4. Costse on the base^ magnified. 



5. MoNTLivALTiA Indica, Dimcan. The corallum, natural size. 



6. The base. 



7. Part of some septa and endotheca, magnified. 

 8.. 



9. > Side views of varieties of Trochosmilia OldhamIj Duncan. 



10. J 



11. Stylina RettssIj Duncan. 



12. Calices, magnified. 



13. Longitudinal section^ showing columella^ magnified. 



14. The costse^ magnified. 



15. M^ANDKiNA Medlicotti, Duncau. Part of corallum^ natural size. 



16. A portion of a seriesj magnified. 



