PLATE 47. 



Cladopora reticulata. Niagara. 



1. Lateral view of a corallum from the Upper Niagara white clay, 



thirteen feet below the "Niagara and Devonian passage-beds, near 

 Louisville. Collection of the author. 



2. View of a corallum, with its apex of growth centrally situated, and its 



fronds radiating in all directions therefrom; found in the horizon 

 of example 1, near Louisville. Collection of Mr. Nettelroth. 



