PLATE 104. 



Cyathaxonia gainesi, IS'ov. Spec. Niagara. 



1. Mew of the calyx of a corallum, 



2. Anterior view of a young corallum. 



3. Left lateral view of a corallum. 



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. Sj^ec. 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 l^roken oif. 



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. 



