Plate LXIX Continued. 



PAGE. 



Tig. 5. T.ENIODICTYA FBONDOSA Ulr. (See also PL LXVII) .............................. 529 



5. Nearly complete frond, with large expanded base, showing natural size 



and irregular distribution of faint monticules. 



Keokuk, Iowa. 



E. O. Ulrich's collection. 

 5 a. Surface of same, x9, showing the usual appearance. 



Several cells of same, x28, where the interspaces appear unworn. 



5 6. 

 5 c. 



Tangential section, x 28, showing the peculiar structure of the walls 

 near the surface. 



Fig. 6. 



(via 



STICTOPOBELLA? UNDULATA Ulr .................................................... 533 



6. Incomplete frond of this species, natural size. 



Chester group, Litchfleld. Ky. 



E. O. Ulrich's collection, 



60. Surface of same, x9. showing arrangement of zooecia apertuies. 

 6 l>. Small portion of surface, x28, showing sloping area around the aper- 



tures of both zooecia and mesopores. 



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IX, ............. (77, X.l linn .in VX J .n u^ 



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