PLATE 137. 



Zaphrentis gigantea. Devonian. 



1. Right lateral view of a corallum of medium size, with a portion of 



the calyx wall removed, so as to show the lamelLie and the dia- 

 phragm or floor of the calyx carinated by the primary lamelhe; 

 from the Lower Devonian rocks, Falls of the Ohio. 



2. Section of a fragment, showing the thickness of the wall, the 



arrangement of the lamellce, and the diaphragms and the in- 

 choate pseudo-diajihragms which, in certain places, apj^ear like 

 dissepiments in the interloculi; from the horizon and locality of 

 the preceding sj^ecimcn. 

 Collection of the author. 



