PLATE LXXVIII. 



PAGE. 



Fig. 1. PKISMOPOBA MINIMA Ulr 506 



1. Two fragments of the natural size. 



Upper Coal Measures, Sparta, 111. 



E. O. Ulrich's collection. 

 1 a. One of them, x9, showing the rather irregular arrangement of the 



zooecia. 



1 b. Transverse section of a branch, x!8, showing its tripartite structure. 

 1 c. Tangential section, x!8, showing distinct lunaria and other characters 



of the zoarium just beneath the surface. 



Fig. 2. GLYPTOPORA PINNATA Ulr 516 



The only example of the species seen. The drawing shows the pinnate 

 arrangement of the zooecia and maculse. The prominence of the latter 

 is largely accounted for by the abrasion which the frond has suffered. 

 Burlington limestone, Burlington, Iowa. 

 Illinois State Museum. 



Fig. 3. GLYPTOPORA PLUMOSA Prout 512 



3 and 3 a. Two fragments of this species, natural size, showing the plumose 

 arrangement of the elongate dimples. 

 Warsaw beds, Warsaw, 111. 

 Illinois State Museum. 



3 b. A small but well preserved fragment, natural size. Same locality. 

 E. O. Ulrich's collection. 



3 c. Portion of 3 b, x9, showing the smooth surface of the dimples and the 



usual arrangement of the zotecia apertures. 



Fig. 4. GLYPTOPOBA KEYSERLINGI Prout 517 



4. Nearly complete leaf or side of a cup of a small, but well preserved ex- 



ample of this species, natural size. 

 Keokuk group, Nauvoo, 111. 

 E. O. Ulrich's collection. 



4 a. Surface of same, x, showing arrangement of zooecia between the 



granulo-striate margin, and one of the dimples. 



4 b. Several zooecia apertures of same, x!8, to show their irregular outline 



and the pitted interspaces. 



Fig. 5. GLYPTOPOKA MEOASTOMA Ulr 518 



5. Surface of an example of this species, x9, showing arrangement of the 



comparative large sub-circular zoceeia aperture*. 

 Keokuk group, Keokuk, Iowa. 

 E. 0. Ulrich's collection. 



5 a. Several apertures of same, x!8. 



