PLATE 59 



Monotrypa cf. tabulata Hall 



Page 225. 



Fig. 1. Enlargement of vertical section showing undulating character of cell walls. 



(X 20.) 

 Fig. 2. Enlargement showing angular zooecia without mesapores. (X 20.) 

 Fig. 3. Transversely fractured zoarium, natural size. 



Unitrypa cf. lata Hall. 

 Page 225. 



Fig. 4. Enlargement of horizontal section showing characters of superstructure, fenes- 

 trules, and zooecia. (X 5.) 



Unitrypa subcircidaris sp. no v. 

 Page 226. 



Fig. 5. Portion of frond, showing impression of superstructure. (X 5.) 

 Figs. 6, 7. Enlargements of horizontal sections, showing characters of the superstruc- 

 tures. (X 15, 20.) 



