PLATE LXV. 



PAGE. 



Fig. 1. SEPTOPOBA PINNATA Ulr. (See also PI. LXIV) 633 



1. Obverse side of a branch and several pinnae, x9, showing the arrangement 

 of the zocecia apertures and tubercles. 



1 a. Portion of flg. 7, on PI. LXIV, x9, showing the characters of the reverse. 



Fig. 2. ACANTHOOLADIA FBUTICOSA Ulr 635 



2. Obverse side of a frond, natural size. 



2 a. Reverse side of several fronds belonging to the same zoarium as flg. 2. 

 2 6. Portion of flg. 2, x9, showing the arrangement of the zooecia and the 



accessory pores. 



2 c. Portion of flg. 2 a, x9. showing the flne stria) and submarginal row of 



accessory pores. 



Upper Coal Measures, Springfield, 111. 



Illinois State Museum. 



Fig. 3. PTILOPOBA PBOUTI Hall 625 



3. Obverse face of a small frond, natural size. 



3 a. Reverse side of another example, natural size. 



3 6, 3 o. Portions of the two faces of 3 a, x9. The bifurcation of a branch so 



near the midrib is an unusual feature. 

 Warsaw beds, Monroe Co., 111. 

 Illinois State Museum. 



Fig. 4. PTILOPOBA ACUTA Ulr 622 



4. Portion of a frond, natural size, showing the acute angle at which the 



branches are given off from the midrib. 



4 a. Obverse face of same, x9, 



Keokuk group, Bentonsport, Iowa. 

 Illinois State Museum. 



Fig. 5. PTTLOPOKA VALIDA Ulr 623 



5. Reverse side of a frond, natural size, showing the full length of the 



branches. Enlarged on PI. LXVI. 



5 a. Obverse face of midrib, with several branches, of the natural size. The 



same is magnified on PI. LXVI. 



5 b. Midrib with large branch, natural size, showing the appearance of the 

 zoarium, when, as is usually the case, the lateral branches are broken 

 away. 



Keokuk group, Bentonsport, Iowa. 

 Illinois State Museum. 



