Plate LXXVII Continued. 



PAGE. 



Fig. 6. MEEKOPORA EXIMIA Ulr 483 



6. Fragment of this species, natural size, showing distribution of maculfle 



and zooeeia. Also view of the left edge, showing the bifoliate charac- 

 ter of the zoarium and the oblique zooecial tubes. 

 Chester group. Monroe Co.. III. 

 Illinois State Museum. 



6 a. Surface of same, x9. 



6 b. Portion of 6 a, x!8. with (?) ooecium. 



6 c. Deep tangential section, x!8, showing faint lunaria and mesopores. 



6 rl. Tangential section, x!8, showing structure just beneath the surface. 



Fig. 7. MEEKOPOKA CLAUSA Ulr. (See also PI. LXX VI) 485 



7. Several zooeeia apertures closed with the perforated opercula, x!8. 



7 a. Portion of the surface of a branch, x9. 



7 b. Vertical section, x!8, from the flexuous median lamina- to the surface. 

 Shows the vesicular tissue and two zooecial tubes. 



Fig. 8. STBOTOPOKA DEKMATA Ulr. ...-. 488 



8. Flattened fragment of this species showing distribution of ooecia; nat- 



ural size. 



Keokuk, Iowa. 



E. O. Ulrich's collection. 



Fig. 9. STKOTOPOKA FOVEOI.ATA Ulr ..487 



9. Small portion of the surface of a large example, natural size, to show 



distribution of zooecia and oo3Cia. 



9 a. Portion of same, x9, showing rather irregular form of zoo?eia apertures 

 the elevated lunaria and two of the broken ocecial cysts. 

 Keokuk group, Bentonsport. Iowa. 

 Illinois State Museum. 



