PLATE 60 



Polypora cf. hexagonalis Hall 

 Page 226. 

 Fig. 1. Enlargement of portion of frond, reverse -side. (X 3.) 

 Fig. 2. Enlargement of portion of frond, obverse side. (X 3.) 



Polypora media sp. nov. 

 Page 227. 



Fig. 3. Enlargement of horizontal section, showing characters of fenestrules, zooecia, 

 and the slightly sinuous branches. (X 5) 



Polypora valida sp. nov. 

 Page 227. 



Fig. 4. Enlargement of portion of the frond, reverse side, showing strong branches. 



(X3.) 

 Fig. 5. Enlargement of horizontal section. (X 5.) 



Cystodictya cf. rigida Hall 

 Page 228. 



Fig. 6. Portion of zoarium showing mesathecal surface, natural size. 



Fig. 7. Enlargement of horizontal section showing character of zooecia. (X 15.) 



