PLATE 123. 



Strombodes pygmceus. Niagara. 



1. View of the upper surface of a corallum, from the white clay of 



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



Strombodes incertus, Nov. Spec. Niagara. 



2. View of the upper surface of a corallum, from the Upper Niagara 



red clay, near Louisville. Collection of the author. 



Strombodes sinemurus, Nov. Spec. Niagara. 



3. View of the upper surface of a corallum, from the Upper Niagara 



red clay, near Louisville. Collection of Mr. McConathy. 



Strombodes mamillaris. Niagara. 



4. View of the upper surface of a small corallum, from the Upper 



Niagara red clay, near Louisville. Collection of the author. 



