PLATE IV. 

 Ekemoptebis bilobata D. W. 



(Page 19.) 



The large liexuose axis of the I'eiu frond, with faintly ribbed central zone and broad border zones, 

 traverses vertically the center of the slab. Two pinnae are given off on the left and three on the right 

 of the axis or rhachis. 



U. S. Nat. Mus., .5699. 



318 



