PLATE XVIIL 



Cycadella knowltoniajia n. sp. 



Fig. I. View of the lower transverse fracture of No. 500.62 of the Museum of 

 the University of Wyoming, showing the leaf bases and walls in 

 longitudinal section overlain by the outer coating. 

 2. View of the polished surface of the upper transverse fracture of No. 

 500.76, somewhat enlarged, showing the attachment of the armor 

 to the axis, the leaf bases emitting the ramentaceous chaff to 

 form the walls and outer layer. 



(294) 



