PLATE V. 



Figure 1. Prion astr^a tenuiseptata, Duncan. The caliceSj very slightly enlarged. 



2. The base of the corallunij natural size. 



3. The junction of the septa and the columella^ magnified. 



4. Prionastr^a insignis, Duncan. The upper surface of coraUum, natural size. 



5. The calices, magnified. 



6. The base. 



7. PterastrjEA mirabiliSj Duncan. The corallum in part, calicular surface, natural size. 



8. Some calices, magnified. 



9. MoNTLivALTiA ViGNEij D'Archiac and Haime. Side view of coral. 



10. The calice^ slightly magnified. 



11. The junction of septa with a trabeculate columella and endotheca, magnified. 

 13. Porites IndicAj Duncan. A part of the coral^ slightly magnified. 



13. Calices, magnified. 



14. Porites Pellegrinii, D'Ach. The corallum. 



15. CaliceSj magnified. 



