PLATE LXX. 



PAOE. 



Fig. 1. RHOMBOPORA NICKLESI Ulr 661 



1. Fragment of the natural size and x!2. 



1 a. Portion of another example, x!2. 



1 li. A very slender branched fragment, x!2. The enlargement of these 

 three fragments is not sufficient to permit of representing the row of 

 minute granules on each side of the summit of the interspaces. 



1 r. Two fragments of medium size. 



Upper Coal Measures, Sparta, 111. 

 E. O. Ulrich's collection. 



Fig. 2. KHOMBOPOKA TABULATA Ulr <>58 



2 and 2 a. Two fragments, showing natural size and mode of branching. 



Chester group, Kaskaskia, 111. 



T.ie first belongs lo the Illinois State Museum, the other to E. (). 



Ulrich's collection. 



2 b. Surface of 2 n, x!2, Showing the usual appearances. 

 2 p. Vertical section, x!8, showing the diaphragms in the axial region and 



other peculiarities of the species. 



Fig. 3. EHOMBOPORA PERSIMILIS? Ulr 659 



Fragment of the natural size and x!2, slightly abraded. This specimen 

 is stronger than usual, and is referred to the species with some doubt. 

 Chester, 111. 

 E. O. Ulrich's collection. 



Fig. 4. RHOMBOPOKA MINOR Ulr 659 



4. Three fragments of the natural size, with parts of two of them x!2. The 



one to the right is the strongest seen, the others of medium size. 

 Chester group, Sloan's Valley, Ky. 

 E. 0. Ulrich's collection. 



4 a. Vertical section, x!8. 



Fig. 5. ACANTHOCLEMA CONFLUENS Ulr 662 



5. Flattened example of the natural size. 



Keokuk group, Nauvoo, 111. 

 E. O. Ulrich's collection. 



5 a and 5 b. Surface of same, x!2 and 24, showing an aTaneement of zooecia 



apertures and nodes between the flexuous ridges. 



