^PLATE 2. 



Lyellia glabra. Niagara. 



1. Upper surface of a corallum from the white clay nine feet below the 



Niagara and Devonian passage-beds, near Louisville. Collection 

 of the author. 



Lyellia papillata. Niagara. 



2. Upper surface of a corallum from the white clay seven feet below the 



Niagara and Devonian passage-beds, near Louisville. Collection 

 of the author. 



Lyellia puella, Nova Species. Niagara. 



3. Upper surface of a weathered corallum from the limestone twelve feet 



below the Niagara and Devonian passage-beds, near Louisville. 

 Collection of the author. 



