PLATE 93. 
CYATHOPHYLLUM OVOIDEUM, Nov. Spee. Devonian. 
1. Upper surface of a corallum from the decomposed chert of the 
Middle Devonian, near Louisville. 
CYATHOPHYLLUM DAVIDSONI. . Devonian. 
2. Upper surface of a corallum from the rotten chert of the Middle 
Devonian, Falls of the Ohio. 
CYATHOPHYLLUM RUGOSUM. Devonian. 
3. Upper surface of a fragment showing cristate calyx-walls, from the 
Middle Devonian red clay, near Louisville. 
Collection of the author. 
