PLATE XL. 

 Tjj:nioptbris? missouetbnsis D. W. 



(Page 140.) 



. 1. Fragmeut in whicL the pinnules are attached by the entire width of the liase. U. S. Nat. Mus., 

 5557. 



2. Upper portion of pinna with connate Alethopteroid pinnules. U. S. Xat. JIiis., 5.556. 



3. Alethoptevoid phase from still higher in the pinna. U. S. Nat. Mus., 5560. 



4. Aijex of the pinna, Alethopteroid, with stronglj' decurrent pinnules. U. S. Nat. Mus., 5558. 



5. Fragment low in pinna, showing basally constricted pinnules attached to central zone of a 



broadly bordered rachis. U. S. Nat. Mus., 5557a. 



6. Fragments of pinnules. U. S. Nat. Mus., 5556a. 



7. Portiiinof a very large pinnule. Specimen in the collection of Dr. J. H. Britts, Clinton. Missouri. 



390 



