PLATE YIL 



Favosites tuberosa var. 



Compare Favosites tuberosa Romiiiger. 



Fig. 1. View of the upper surface of a large specimen, showing the form of the cells and the par- 

 tial transverse diaphragms. Upper Helderberg hraestone, near Akron, N. T. 



Favosites epiderjiata ? var. biloculi. 



Occurring in spreading flattened masses. 



Fig. 2. View of the upper surface of a large flat specimen, showing cells of two dimensions, the 

 larger of which are mostly filled with quai-tz, and having resisted the weathering 

 action, project above the smaller cells. Upper Helderberg group, Caledonia, N. Y. 



