PLATE 133— Continued. 



Zaphrentis obliqua, Nov. Spec. Niagara. 



15. Left lateral view of a corallum. 



16. Posterior view of a corallum. 



17. View of the calyx of a corallum. 



From the horizon and vicinage of Z. conulus. Collection of the 

 author. 



Cyathophyllum exiguum. Devonian. 



18. View of the calyx of a large corallum, from the Lower Devonian 



rocks, Falls of the Ohio. Collection of Mr. McConathy. 



19. View of the calyx of a corallum of average size, from the horizon 



and locality of example 18. Collection of the author. 



20. Posterior view of a corallum. 



21. Right lateral view of a corallum. 



22. View of the calyx of a corallum. 



[Note. — In example 22 the lamelhi; from the inner rim to the outer rim of the calyx wall seem to be 

 faintly carinated. Other examples are so obscurely carinated as to superficially resemble Zaphrentis, with 

 which genus they have been classed by Rominger.] 



Specimens 20, 21, 22, are ft'om the ferruginous clay of the Lower 

 Devonian, near Louisville. Collecticm of the author. 



Cyathophyllum exiguum, varietas elongatum, Nov. Var. Devonian. 



23. Left lateral view of a robust corallum, from the Lower Devonian 



rocks. Falls of the Ohio. 



24. View of the calyx and oblique anterior view of a corallum, from 



the Lower Devonian ferruginous clay, near Louisville. 

 Collection of the author. 



Zaphrentis reynoldsi, Nov. Spec. Devonian. 



25. Anterior view of a corallum. Collection of the author. 



2G. Left lateral view of a corallum. Collection of Mr. Nettelroth. 



27. View of the calyx of a corallum. Collection of Mr. Nettelroth. 

 From the ferruginous clay of the Lower Devonian, near Louisville. 



Zaphrentis linneyi, Nov. Spec. Devonian. 



28. Posterior view of a corallum. Collection of the author. 



29. Left lateral view of a corallum. Collection of the author. 



