PLATE LXIV. 



PAGE. 



Fig. 1. HEPTOPORA CESTBIENSIS Prout 628 



1. Obverse face, x9, showing the rounded fenestrules and few zooecia on 



the dissepiments. 



1 a. Branch of same specimen, x!8, showing accessory pores and some of 

 the apertures closed with opercula-like plates. 



1 b. Beverse face of another frond, x9. 



Chester. 111. 



Illinois State Museum. 



Fig. 2. SEPTOPOBA SUBQUADRANS Ulr. (See also PI. LVD 620 



2. Obverse face of a frond of this species, natural size. 



2 a. Portion of same, x9, showing the old state slightly abraded. 

 2 6. Beverse of another frond, x9. 



2 c. Obverse side of two branches, x9, showing a less mature condition 



than in flg. 2 a. 



Sloan's Valley, Ky. 



E. 0. Ulrich's collection. 



Fig. 8. SEPTOPOBA ROBUSTA Ulr. (See also PI. LVI) 633 



3. Beverse aspect of a frond of this species, natural size. 



Upper Coal Measures, Fayette, Co., 111. 

 Illinois State Museum. 



3 a. Surface of same, x9, showing the strong branches and numerous acces- 



sory pores. 



Fig. 4. SEPTOPOBA BOBUSTA var. INTERMEDIA Ulr. (See also PI. LVI) 634 



4. Obverse face of a frond, x9, showing the large zooecia apertures. 



4 a. Beverse side of another specimen, x. 



Chester group, Sloan's Valley, Ky. 

 E. 0. Ulrich's collection. 



Fig. 5. SEPTOPOBA DELICATULA Ulr 634 



5. A frond of the natural size. 



5 a. Portion of same, x9. 



Lower Coal Measures, Seville, 111. 

 Illinois State Museum. 



