PLATE XXVII. 



Pecoptekis dentata Brongu. 



(Page 75.) 



Upper portion of a primary pinua, showing very large pinnules in the uppermost secondary 

 plnnfe, and ordinary and typical pinnules in tertiary pinnas a little above the middle of the specimen. 

 The lower portion of the segment is fertile, the margins of the pinnules being rolled backward a little 

 and buried in the matrix. U. S. Nat. Mus., 5621. 



An enlarged detail of sterile pinnules of this specimen is given in PI. XXVI, Fig. 4. 



364 



