PLATE LXII. 



PAGE. 

 Fig. 1. POLYPOBA WHITKI var. INSCULPTA Dlr tfOO- 



1. Natural size view of a fragment of this species. 

 1 a. Surface of same, xS. 



1 ft. Branch, x!8, to show the peculiar surface characters. 

 Upper Coal Measures, Springfield, 111. 

 E. O. Ulrich's collection. 



Fig. 2. POLYPORA WHITEI UlT WX>' 



2. Obverse surface, x!8, showing two and three ranges of zooacia. 



Lower Coal Measures, Seville, II 1 . 

 Illinois State Museum. 



Fig. 3. CHAINODICTYON LAXUM var. MINOB Ulr ftM* 



3. Reverse aspect, natural size. 



3 a. Portion of same, x7, showing the relative size of branches and fenes- 



trules, and the curved transverse folds. 

 Lower Coal Measures, Seville, 111. 

 Illinois State Museum. 



Fig. 4. THAMNISCUS BAMULOSUS Ulr 610' 



4. Two specimens of the natural size. 



4 a. Obverse surface, x9, showing the thin dissepiments and the arrange- 



ment of the papilliform apertures. 



4 l>. Reverse of young example, x!8, showing distinct longitudinal strite. 



Chester group, Sloan's Valley, Ky. 

 E. O. Ulrich's collection. 



Fig. 5. THAMNISCUS SEVILLENSIS Ulr.* (See also PI. LV) 610' 



5. Natural size view of a nearly complete specimen. 



5 a. Poriferous surface, x9, showing zooecia apertures in different states of 



preservation. 



Lower Coal Measures, Seville, III. 



Illinois State Museum. 



Fig. (i. THAMNISCUS DIVABICANS Ulr 60S 



6. Obverse side of an example without dissepiments. Natural size. 



6 a. Surface of same, x9. 



6 b. Obverse side of a fragment showing natural size, comparatively rigid 



branches, and remote dissepiments. 

 6 c. Reverse side of another specimen. 



Keokuk, group, King's Mountain, Ky. 



E. O. Ulrich's collection. 



'Specimens, recently collected by the author at Seville, show this form to be suffi- 

 ciently distinct from T, ramulosus to entitle it to specific rank. 



