PLATE X 



1. Aviculopecten coxanus Meek and Worthen, x 2, Cannel Coal Mine, Flint Ridge. 



2. Aviculopecten occidentalis (Shumard), x 2, Bald Knob. 



3. Aviculopecten herzeri M.eek, X 2, Somerset. 



4. Acanthopecten carboniferus (Stevens) Bald Knob. 



5. Euchondria neglecta Geinitz, x 2, Bald Knob. 



6. Pecten {Entoliwn) aviculatus (Swallow) Limestone Hollow, Flint Ridge. 



7. Entolium attenuatum Herrick, Cannel Coal Mine, Flint Ridge. 



8. Ldma retifera Shumard, x 2, Limestone Hollow, Flint Ridge. 



9. Placunopsis carhonaria Meek and Worthen, Cannel Coal Mine, Flint Ridge. 



10. Allorisma terminale Hall, Cannel Coal Mine, Flint Ridge. 



IL Pleurophorus tropidophorus Meek, Limestone Hollow, Flint Ridge. 



12. Pleurophorus oblongus Meek, Bald Knob. 



13. Pleurophorus subcostatus Meek and Worthen, Limestone Hollow, Flint Ridge. 



14. Cypricardinia carhonaria Meek, Bald Knob. 



15. Astartella vera Hall, Limestone Hollow, Flint Ridge. 



16. Astartella newberryi Meek, Cannel Coal Mine, Flint Ridge. 



17. Astartella varica McChesney, Limestone Hollow, Flint Ridge. 



18. Crinoid segments, Somerset. 



19. Crinoid segment, Fiiltonham. 



