1'LATK XXX. 



Fig. 1. PTLLOTIIYPA OBLIQUATA Ulr 





1. A fragment of the species. Natural size. 



1 . Surface of same xis>. 



1 I,. Tangential section showing usual characters and accessory pore- 



1 <: Vertical section. Natural sixo. 



1 'I. Portion of same x!8. 



1 f. Transverse section xlS. 



Cincinnati group. Will Co., III. 

 Illinois State Museum. 



Fig. 2. EUEYDIOTYA STEBLINOEKSIS Ulr 



2. A. fragment. Natural size. 



2 a. Portion of surface x!2. 



Cincinnati group, Sterling, III. 

 Illinois State Museum. 



Fig. :j. E0KYDICTYA MONTIFEBA Ulr... 



3. A frond showing distribution and character of 

 '! a. Surface of same x!2. 



3 !>. Tangential section x!8. 



3 ' '' 



onhe "' " f ' 



rf. Half of a transverse section. x!8, showing median htbnli 

 Cincinnati group. Wilmington, 111. 

 Illinois State Museum. 



EUKYMCTYA CALHOUKENSIS Ulr ..... 



4. Fragment of a frond. Natural size. 



4,,. Surface x!8. The solid monticule'is an usual feat,,,,- 



4 <>. Tangential .section xlS. 



4 f. Portion of a vertical section x!8. 



Trenton limestone. Calhoun Co., III. 



Illinois State Museum. 



