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 PLATE 104. 



Cyathaxonia gainesi, Nov. Spec. Niagara. 



1. View of the calyx of a corallum. 



2. Anterior view of a young corallum. 



3. Left lateral view of a corallum. i 



4. Right lateral view of a corallum. 



5. Posterior view of a corallum. 



6. Anterior view of a corallum. 



From the lowest strata of the Niagara period, near Louisville. 



Ptychophyllum ipomcea, Nov. Spec. Niagara. 



7. (Upper left specimen.) Under surface of a corallum, from the 



Upper Niagara white clay, near Louisville. 



Omphyma verrucosa. Niagara. 



8. (Central specimen.) Right lateral view of a corallum, from the 



Upper Niagara ferruginous clay, near Louisville. 



9. (Right central specimen.) Right lateral view of a corallum, from 



the white clay beds of the Upper Niagara, near Louisville. 



10. Posterior view of a corallum, with part of the calyx wall broken off. 



11. Anterior view of a large corallum, with partially denuded epitheca. 

 Examples 10 and 11 are from the horizon and vicinage of exam- 

 ple 8. 



All the specimens are from the collection of the author. 



