PLATE 131. 



Calceola PROTEUS, Nov. Spec. Niagara. 



1. Anterior view of a proliferous corallum, 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 corallum, from the white clay of the 



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



4. Posterior view of a corallum 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 corallum, from 



the horizon and neighborhood of example 4. Collection of the 

 author. 



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



the locality of specimen 5. 

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

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



7. Oblique view of a corallum, 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 opercula; 



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



author. 

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



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



Collection of Mr. Nettelroth. 

 17. View of the operculum of a small corallum fi-om the same place. 



Collection of the author. 



10. View of a gem detached from its parent. 



11. Posterior view of a gemmiferous corallum. 



12. Posterior view 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. IS an oblique posterior view of a corallum of Calceola sandalina, 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.] 



