PLATE IV. 



Favosiies tuberosus var. 



Farosites tuberosa Rominger, in part. 



Fig. 1. View of a subclavate specimen, showing the form and size of tlie cells, and in some parts 

 the complete tabulre. Upper Helderberg Limestone, Cayuga, Ontario. 



Favositks hemispherica var. tukrinata. 



(See also Plate 2 B.) 



Fig. 2. Lateral view of a large, curved, subturbinate specimen, covered by the epitheca which 

 allows the cell-walls to be seen projecting through its substance. Upper Helderberg 

 Limestone, Cayuga, Ontario. 



