Plate LXXII Continued. 



PAGB 



Fig. 6. ANISOTBYPA FISTULOSA Ulr 448 



6. A fragment of the usual size. 



6 a. Another fragment broken so as to show the epitheca lining the inner 



side of the branches. Natural size. 



St. Louis group, Pella, Iowa. 



Illinois State Museum. 

 6 6. Vertical section, x!8, showing the perforated diaphragms and other 



features of two layers, and a portion of a third. 



6 e. Tangential section. x!8, showing varying thickness of walls, and per- 



forated diaphragms. 



Fig. 7. ANISOTBYPA BAMULOSA Ulr 449 



7 and 7n. Two examples of this species, natural size. The stems are solid 



but their surface and tangential sections are much like .1. fistiilosa. 

 St. Louis group, Pella. Iowa. 

 Illinois State Museum. 



Fig. 8. STENOPOBA BUDIS Ulr 444 



8. An irregular hollow branch of this species, natural size, showing faint 

 monticules and, at the upper end, the thickness of the zoarium. 



8 a. Tangential section. x!8, showing acanthopores, several perforated dia- 



phragms, and variations in the thickness of the walls. 



8 b. Vertical section, x!8, showing two distinct layers of zooacia tubes, their 



tabulation, and slightly moniliform characters of the walls. 

 Chester group, Sloan's Valley, Ky, 

 E. 0. Ulrieh's collection. 



Fig. 9. ANISOTKYPA SOLID A Ulr 449 



9 and 9 a. Two examples of the natural size. 



Chester group, Sloan's Valley, Ky. 



E. O. Ulrieh's collection. 



9 li. Tangential section, x!8. From a Sloan's Valley specimen. 

 9 c. Small portion of a tangential section. x50, showing structure of walls 



very clearly, From a Chester, 111. example. 

 9 d. Vertical section, x!8, from a Sloan's Valley specimen. In this the 



beaded structure of the walls in the peripheral region is more marked, 



than in flg. 9 t. 

 9 e. Vertical section of an old example from Chestor, 111., in which the walls 



are only very sligtrly moniliform. 



