EXPLANATION OF PLATES. 



PLATE 50. PAGE 



CySTIPHYLLUM FULCRATUM, N. Sp. 169 



Figure No. 1 — Lateral view of the type speeinfen. 



PROTOPORA CYSTOIDES. 169 



CYSTIPHYLLUM CLAVATUM. N. Sp. 170 



Figure No. 2 — Lateral view of the type specimen. 



