^PLATE 12. 



Favosites epidermatus. Devonian. 



1. Upper surface of a corallum from the ferruginous clay of the Middle 



Devonian, near Louisville. Collection of the author. 



Favosites radiatus. Devonian. 



2. Upper surface of a corallum from the Lower Devonian strata, Falls 



of the Ohio. Collection of the author. 



Favosites emmonsi. Devonian. 



3. Lateral view of a corallum from the Lower Devonian, Falls of the 



Ohio. Collection of the author. 



4. Upper surface of a corallum from the same horizon and locality. Col- 



lection of the author. 



