PLATE 8. 



Favosites favosus. Niagara. 



1. Upper surface of a fragment from the ferruginous elay, near Louis- 

 ville. Collection of Mr. Nettelroth. 

 2." Longitudinal section of an example wlioso corallets are smaller, found 

 in the same horizon and locality. Collection of the author. 



Favosites niagarensis. Niagara. 



3. Upper surface of a corallum, composed of very small corallets, show- 



ing spinulous walls ; near Louisville. Collection of the author. 



4. U^jper surface of an example, composed of the largest sized corallets, 



with smooth walls; near Louisville. Collection of the author. 



Favosites Forbesi. ' Niagara. 



5. Upper surface of a large corallum found near Louisville. Collection 



of Mr. McConathy. 



6. View of epithecatcd under surfiice of a corallum of average size; near 



Louisville. Collection of the author. 



Favosites spongilla. Niagara. 



7. 8. 9. Lateral views of coralla found near Louisville. Collection of 



the author. 



