PLATE 3. 
LYELLIA PAPILLATA. Miagara. 
1. Portion of the upper surface of a corallum from the ferruginous clay 
just below the Niagara and Devonian passage-beds, near Louis- 
ville. Collection of the author. 
LYELLIA AMERICANA. Niagara. 
2. Upper surface of a corallum from the white clay ten feet below the 
Niagara and Devonian passage-beds, near Louisville. Collection 
of the author. 
