PLATE 123. 



Strombodes pygmceus. Niagara. 



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



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



Strombodes ixcertus, Nov. Spec. Niafjara. 



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



red clay, near Louisville. Collection of the author. 



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Strombodes sixemurus, Nov. Spec. Niagara. 



3. View of the upper surftice 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, fi'om the Upper 



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



