Plate LXX Continued. 



PAGE. 



Fig. 6. RHOMBOPORA ANGUSTATA Ulr 6'2 



6. Fragment of the natural siz. anil a portion x!2. 

 (i a. Another portion of same, x!2. 



Keokuk group. King's Mountain. Ky. 



E. O. Ulrieh's collection. 



Fig. 7. RHOMBOPORA ATTENUATA Ulr 655 



Two examples showing natural size, and a portion of one, xli 

 Keokuk group, Warsaw, 111. 

 E. O. Ulrich's collection. 



Fig. 8. RHOMBOPORA TENUIRAMA Ulr 660 



8 and 8 a. Fragment of the natural size, with portions xl'2 and 24. 



8 l>. Branching fragment, natural size, and x24. 



Chester group. Kaskaskia, III. 

 E. O. Ulrich's collection. 



Fig. 9. RHOMBOPOKA? ASPHRULA Ulr 656 



9 and 9 a. Well preserved slender fragment of the natural size, with a por- 



tion x!2. 



Keokuk group, Nauvoo, III. 

 E. O. Ulrich's collection. 



9 /i and 9 e. A stronger example, in the ordinary state of preservation, 

 natural size, and a part of the surface x!2. 

 Keokuk, Iowa. 

 E. O. Ulrich's collection. 



9 d and 9 e. Portions of two tangential sections, x!8, showing the irregular 



arrangement of zoopcia and acanthopores. 



Fig. 10. RHOMBOPOBA EXIGUA Ulr 651 



10 and 10 a. An example of the natural size, with two portions of the sur- 



face x!2. 



Burlington limestone, Burlington, Iowa. 



Illinois State Museum. 



Fig. 11. RHOMBOPORA GRACILIS Ulr 651 



11. Very complete example of the natural size. 

 Burlington limestone, Burlington, Iowa. 

 Illinois State Museum. 



11 a. Portion of the surface where the cells are irregularly arranged, x!2. 



11 It. Usual appearance of surface, x!2. 



Fig. 12. RHOMBOPORA INCKASSATA Ulr 652 



12 and 12 a. Two branching fragments, natural size. 



Keokuk group. King's Mountain. Ky. 



E. O. Ulrich's collection. 



12 b. Another fragment of the natural size, and x!2. From the same locality. 

 12 c. Tangential section, x!8. 

 12 d. Transverse section, x!8. 



