PLATE XXV. 



Ptychophyllum versiforme.* 

 n Page 426. 



Fig. 1. Lateral view of an elongate and irregular growing individual. 

 Fig. 2. Lateral view of a short and broad specimen. 

 Fig. 3. A calyx showing the strong, coarse rays. 

 Fig. 4. A calyx where the rays are partially obliterated by silicification. 



Ptychophyllum striatum. 

 Page 426. 

 Fig. 5. Lateral view of a specimen. 

 Fig. 6. Posterior view of another individual. 

 Fig. 7. The calyx of the preceding. 

 Fig. 8. Side view of the wall of the cup, enlarged to two diameters. 



* This specific name is retained for the present. It does not seem advisable to make the 

 separation and distinction as given in the Twelfth Indiana Report for Ptychophyllum 

 Knappi. 



