EXPLANATION OF PLATES. 



PLATE OS. PAGE 



ZAPHRENTIS CALLOSUS. N. Sp. 198 



FIGS. 1, 2 — Posterior views of two different examples, part of the cup 

 is broken away from each to show the lamellae and tabulae. 



HELIOPHYLLUM CONDITUM, N. Sp. 199 



FIG. 3 — Lateral view of a simple example. 



FIGS, -i, 5 — Ventral views of two different examples. 



FIG . 6 — Lateral view of another individual, showing the elevated tab- 

 ulae in the center of the calix. 



HAIMEOPHYLLUM ORDINATUM. Billings. 198 



FIG. 7 — Lateral view of a fragment showing the contraction and ex- 

 pansion of the corallites. 



FIG. 8 — Ventral view of the same. 



DIPHYPHYLLUM DILATUM, N. Sp. 199 



FIGS. 9, 10 — Calix view of two different individuals. 

 FIGS. 11, 12 — Postero'-lateral views of two different examples. 



