PLATE XXTX. 

 Pecopteris psetjdotestita D. W. 



(Page 85. ) 



Portion of a slab 36 cm. in height covereti by parallel sections from the interior of large pinnse. 

 The large size of the rachises of the two segments shown in this plate indicate a great length, 

 perhaps more than 5 meters for the large pinnae, which evidently belonged to the same individual 

 tree fern. It is not, however, certain whether these large fragments of rachis proceeded directly 

 from the trunk or axis of the fern or whether, as their close parallelism suggests, they belong only to 

 lateral pinna= of giant fronds of the fern. A detailed enlargement of one of the ultimate pinnse of 

 this specimen is shown in PI. XXVIII, Fig. 3. U. S. Nat. Mns., 5648. 



In the lower right-hand corner of the plate are seen several rather dim fragments of Pecopteris 

 din ton i Ls. 



