Explanation of Plate 1. 



Tseniopteris missowriensis, n. sp. 



Figure 1. — Fragment from upper middle portion of pinna. Pinnules nearly dis- 

 tinct. 



Figure 2. — Portion near tip of pinna. Pinnules confluent. 



Figures 3 and 4. — Apex of pinna, showing true AklhopU m development. 



Figure 5. — Fragment from middle of pinna, showing taeniopteroid pinnules, dis- 

 tinct, contracted at the base, attached to the central axis of the 

 rachis. 



Figures 6 and 7. — Fragments of detached pinnules. The broad character of the 

 median canal is not well indicated, nor the wide midrib, especially 



prominent on the back of the pinnule. The origin of the nervils in 

 the median strand is well represented. 



(132) 



