I 'LATE 131. 



Calceoea proteus, Nov. Spec. Niagara. 



1. Anterior view of a proliferous eorallum, from the Upper Niagara 



white clay, near Louisville. Collection of the author. 



2. View of portions of some corallets partly imbedded in rock matrix; 



from the Upper Niagara strata, Falls of the Ohio. Collection 

 of Mr. Nettelroth. 



3. Posterior view of a large eorallum, from the white clay of the 



Upper Niagara, near Louisville. Collection of Mr. Nettelroth. 



4. Posterior view of ;i eorallum of average size, from the red clay of 



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



5. View of the calyx and oblique anterior view of a eorallum, from 



the horizon and neighborhood of example 4. Collection of the 

 author. 



6. View of the calyx and oblique posterior view of a eorallum, from 



the locality of specimen 5. 

 8. 9. Oblique views (8 inverted) of small coralla, from the Upper 

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



7. Oblique view 5 of a eorallum, whose calyx is closed by an opercu- 



lum; from the white clay of the Upper Niagara, near Louisville. 



Collection of Mr. Nettelroth. 

 14. 15. 16. Oblique views of coralla, with calyces closed by opereula; 



from the horizon and vicinage of specimen 7. Collection of the 



author. 

 13. View of the exterior surface of the operculum of a eorallum of 



average size; from the horizon and neighborhood of example 7. 



Collection of Mr. Nettelroth. 

 17. View of the operculum of a small eorallum from the same place. 



Collection of the author. 



10. View of a gem detached from its parent. 



11. Posterior view of a gemmiferous eorallum. 



12. Posterior view r of a fortuitously detached gem. 



Specimens 10, 11, 12, are from the Upper Niagara red clay strata, 

 near Louisville. Collection of the author. 



[Note. — In Fig. 18 an oblique posterior view of a eorallum of Cukeola mndalina, an European form 

 said to be from the Devonian strata of the Eifel, closed by an operculum, is here presented for com- 

 parison with our Niagara species.] 



