EXPLANATION OF PLATES. 



PLATE 5. PAGE 



HELIOPHYLLUM AGASSIZI, N. Sp. 14 



FIG. 1 — Calix view of a compound example. 



HELIOPHYLLUM NILESI, N. Sp. 15 



FIG. 2 — ^Lateral view of a compound example. 

 FIG . 3 — Lateral view of another individual. 



HELIOPHYLLUM TURGIDUM, N. Sp. 15 



FIG. 4 — Lateral view. 



FIG . 5 — Calix view of another example. 



BLOTHROPHYLLUM FLEXUOSUM, N. Sp. 10 



FIG. 6 — Lateral view. 



FIG . 7— Lateral view of another large example. 



FjQ.^ 8 — Calix view of another individual. 



CYSTIPHYLLUM CRASSATUM, N. Sp. H 



FIG. 9 — Calix view. 



FIG . 10 — Basal view showing epitheeal crust. 



