PLATE XI. 



FAGE. 



Figs. 1-3. Discina Meekana Whitf. 483 



1 and 2. Vertical and profile views of an upper valve from Carbon Hill, Ohio. 

 3 Vertical view of another imperfect specimen. 



Figs. 4-5. Cyathocrinus Somersi Whitf. 482 



•1. 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. 



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

 spine. The specimen bears a valve of crania Carbonaiia. 



10. Lateral view of a more slender spined plate. 



Figs. 11-12. Crania carbonaria Whitf. 484 



11. Viewof a valve of Sckizodus 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. 



giganleus. M. and W. 



Fig. 13. Macrocheilus regularis Cox 485 



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



Figs. 14-15, Loxonema plicatum Whitf 486 



14. Lateral view of a specimen natural size. 



15. View of the last volution enlarged. 



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



ltT. Lateral view of the specimen showing the features of the species as far a< known. 



