PLATE XI. 



PAGE. 



Figs. 1-3. Discina MeEkana Whitf. 483 



l and 2. Vertical and profile views ofati upper valve from Carbon Hill, Ohio. 

 3 ■ Vertical view of another imperfect specimen. 



Figs. 4-5. Cyathocrinus Somersi Whitf. ; 482 



4. Basal view of the specimen, natural size. 



5. Enlarged radial plate showing the character of the nodes. 



Figs. 6-10. Zeacrinus Mooresi Whitf '. ; 483 



6. Basal view of a calyx. 



■ 7. Anal view of the same. 



s and 9. Lower and lateral views of a second radial plate showing- the character of the 

 spine. The specimen bears a valve of crania Carbonaria. 



10. Lateral view of a more slender spined plate. 



Figs. 11-12. Crania carbonaria Whitf. 484 



11. Viewof a valve of Schizodus ampius Meek and Worthen, bearing a number of at- 



tached valves of this species. , 



12. Another lower valve parasitic on the "operculum of Naticopsis altonensis var. 



giganteus M. and W. 



Fig. 13. Macrocheilus regularis Cox 485 



13. Front viewof a specimen from Carbon Hill, Ohio. 



Figs. 14-15. IvOxonema plicatum Whitf .' 486 



14. Lateral view of a specimen natural size. 



15. . View of the last volution' enlarged. 



Fig. 16. Nautilus (Gyroceras?) subquadrangularis Whitf. 487 



16. Lateral view of the specimen showing the features of the species as far as kuowu. 



