PLATE XXVII. 



Figure 1. Monticulastr^a elongata^ Duncan. A part of the corallum, natural size. 



2. CollineSj magnified. 



3. HELiASTRiEA SiNDiANAj Duucau. A part of the corallunij natural size. 



4. Calices, magnified. 



5. Phyllocoenia confertAj Duncan. The corallum, natural size. 



6. Calices, magnified slightly. 



7. A calice with costse^ magnified. 



8. Cyathoseris irregularis, Duncan. A worn specimen, natural size, 



9. Trochoseris aperta, Duncan. A side view, natural size. 

 10. The calice, magnified. 



