LIST OF ILLUSTRATIONS AND MAPS. 



General Section of the Rocks of Ohio Faces page 4 



Figure of Cot allidomus concentricus Page 493 



Figures of Annelid teeth 



Figures of Orthocerata 



Figure of Byssonychia vera 



Figures of Opisthoptera extenuata.. 



Figure of Clionychia subundata 



Figures of Actinomya cancellata 



517 

 540 

 629 

 645 

 651 

 657 



MAPS SHOWING BOUNDARIES OF PRINCIPAL COAL SEAMS. 

 (IN ENVELOPE.) 



1. In Lawrence, Gallia and Jackson Counties, (in part). 



2. In Jackson, Vinton, Meigs and Gallia Counties, (in part). 



3. In Hocking, Perry, Athens and Vinton Counties, (in part). 



4. In Muskingum, Licking, Perry and Morgan Counties, (in part). 



5. In Coshocton and Holmes Counties. 



6. In Tuscarawas, Harrison, Stark and Carroll Counties, (in part). 



7. In Columbiana, Jefferson and Carroll Counties, (in part). 



8. In Guernsey and Stark Counties, (in part). 



9. The Pittsburgh and Meigs Creek Coal Seams. 

 10. The Coal Fields of Ohio. 



