PLATE LXXI. 



PAGE 



Fig. 1. BHOMBOPORA VARIANS Ulr 



] . Strong example of the natu al size. 



Kookuk group, Warsaw, III. 



Illinois State Museum. 

 1 re. Surface of same. x!2, showing the appearance about midway between 



the base and the first bifurcation. 

 1 1>. About the same region on tig. lo. x!2. 

 1 c. A small example from near Plymouth, 111. 



Illinois State Museum. 

 1 d. Upper end of flg. If. x!2. 

 1 e. Tangential section of old example, x!8, showing structure at different 



levels. 



1 /. Half of a vertical section. x!8. 



Fig. 2. BHOMBOPOBA SIMULATBIX Ulr '>">' 



2. Bather small example, natural size, and a portion x!2. 



2 a. The smallest specimen seen, natural size. 

 2 li. Rather strong fragment, natural *ize. 



St. Louis group, Columbia, 111. 



E. 0. Ulrich's collection. 

 2 c. Strongest specimen seen, natural size. 



Monroe Co., 111. 



Illinois State Museum. 

 2 d Tangential section, x!8. 



2 e A little more than half of a vertical section, x!8, showing several hemi- 



septa. 



Fig. 3. BHOMBOPOEA DECIPIENS Ulr <*" 



3 and 3a. Three specimens showing variations in size and mode of branch- 



ing, natural size. 



St. Louis group, Monroe Co., III. 



Illinois State Museum, 

 3 b. Surface of an example like flg. 3, x!2. 

 3 c. About two-thirds of a vertical section, x!8, showing superior hemi- 



septa, and peculiai ities in the development of the zooecia. 

 3 d. Tangential section, x!8, showing thicker walls than usual. 



