PLATE 121. 



Strombodes striatus. ' Niagara. 



1. View of the upper surface of a weathered corallum, from the ferru- 



ginous chxy of the Upper Niagara, near Louisville. Collection 

 of the author. 



Strombodes pentagonus. Niagara. 



2. View of the upper surface of a fragment, from the white clay of 



the Upper Niagara, near Louisville. Collection of the author. 



3. View of the upper surface of a corallum, from the red clay of the 



passage-beds between the Niagara and Devonian rocks, near 

 Louisville. Collection of the author. 



Strombodes sinemurus, Nov. Spec. Niagara. 



4. View of the upper surface of a corallum, from the horizon and neigh- 



borhood of S. pentagonus. Fig. 2. Collection of Mr. McConathy. 



