EXPLANATION OF PLATES. 



PbflTB 19. PAGE 



HELIOPHYLLUM SPICULATUM, N. Sp. 56 



FIG. 1. — Lateral view showing the spicules. 



BORDENIA ZAPHRENTIFORMIS, N. Sp. 57 



FIGS. 2-3-4. — Posterior views, exhibiting the calicu- 



lar gemmation. 

 FIGS. 5-8-9. — Lateral views of different examples. 

 F I Q. 0. — Longitudinal section of another specimen 



showing the base of a bud. 

 F I Q. 7. — Longitudinal section, exhibiting the oblique 



tabulae. 



CYSTELASMA SEPT AT A, N. Sp. 56 



FIG. 10. — Calix view of a matured individual. 



FIGS. 11-14. — Posterior views of two other examples. 



FIGS. 12-15-17-18-19. — Longitudinal sections show- 

 ing the longitudinal partitions, and the tab- 

 uhe, all different examples. 



FIG. 13. — Anterior view of another individual. 



FIG. 18. — Lateral view of another specimen appearing 

 as invaginated cups. 



MONILOPORA BEECHERI, Grabau. 50 



FIG. 20. — A specimen showing normal form of the ir- 

 regular wandering type. Edwardsville, Ind. 



FIG. 21. — A compact colony attached to a Platycrinus. 

 Crawfordsville, Ind. 



CERATOPORA AGGLOMERATA, N. Sp. (Grabao.) 51 



FIGS. 22-23-25. — Ventral views of different examples. 

 FIG. 24 — Oblique view of another example exhibiting 

 the stems. 



