PLATE XXI. 



Figure 1. PmoNASTRiEA fungifokmis, Duncan. Portion of upper surface of corallumj natural size. 

 3. Brachyphyllia Indica^ Duncan. Part of corallum, natural size. 



3. Plesiastr^a DECiPiBNSj Duncan. Part of corallum^ natural size. 



4. Calices, magnified. 



5. D^AcHiARDiA densa. The corallum, natural size, 



6. Calices, magnified. 



7. Heliastr^a digitata. The coraUum, natural size. 



8. Calices, magnified. 



9. Plesiastr^a pedunculata. Some calices, natural size. 

 10. Heliastr^a anomala. Some calices, natural size. 



