EXPLf\Nf=\TION OF PLATES. 



PLATE I. PAGE 



HELIOPHYLLUM OSCULATUM. N. Sp. 1 



FIG. 1. — Upper view of a large corallum from 

 Crab Orchard, Kentucky. 

 See Plate ii, Figs. 1-2-3. 



HELIOPHYLLUM NANUM, N. Sp. 



FIG. 2.— View of the calyx. 



FIG. 3. — View of the calyx of another individual. 



FIG. 4. — Lateral view of another example. 



HELIOPHYLLUM TUMIDULUM, N. Sp. 



FIG. 5. — View of the calyx. 



FIG. 6. — View of the calyx of another individual. 



FIG,. 7. — Lateral view of another example. 



ZAPHRENTIS HUMILIS, N. Sp 



FIG. 8. — Lateral view. 



FIG. 9. — Calj^x view of another individual. 



