PLATE 17. 
FAvosITES AMPLISSIMUS, Nov. Spec. Devonian. 
1. Upper surface of a corallum from the ferruginous clay of the Lower 
Devonian, near Louisville. Collection of Mr. Nettelroth. 
2. View of a portion of the under surface of a corallum from the Lower 
Devonian, Falls of the Ohio. Collection of the author. 
3. Upper surface of a corallum from the Lower Devonian, Falls of the 
Ohio. Collection of the author. 
