PLATE XXI. 

 Oligocarpia missoueiensis D. "W. 



(Page 66.) 



Fig. 1. Fragment with slender fertile lateral pinnte supposed to be referable to this species. The 

 sori are impressed in the lamina and show on the upper surface of the pinnules as minute, 

 dome-shaped elevations. Lacoe collection, U. S. Nat. Mus., 4467. 

 la. Enlarged detail of pinnule of the same. X2. 



2. Terminal yiortion of pinna of same character as that shown in Fig. 1. Lacoe collection, U. S. 



Nat. Mus., 4468. 

 2a. Enlarged small pinna from the same specimen. X2. 



3. Fragment of secondary pinna of 0. missouriensis, representing the form shown in PI. XX, 



Figs. 1, 2. U. S. Nat. Mus., 5695. 



4. Another specimen similar to that in Fig. 3, but smaller, the sori showing as dark spots on the 



pinnules. U. S.Nat. Mus., 5696. 



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