PLATE IV. 



Page. 



POTERIOCRINUS BLAIRI, n. 8p 61 



Fig. i. Azygous side view. 

 Pig. 2. Opposite side view. 



POTERIOCRINUS ALTONENSIS, II. Sp 62 



Fig. 3. Calyx and arms; azygous side on the right. 

 Fig. 4. Opposite side of same. 



POTERIOCRINUS BROADHEADI, n. Sp 63 



Fig. 7. Azygous side view of calyx. 

 Fig. 8. Opposite side of same. 



POTERIOCRINUS SAMPSON1, n. Sp 65 



Fig. 9. Azygous side view of calyx. 

 Fig. 10. Opposite side of same. 



Zeacrinus blairi, n. sp 66 



Fig. 5. View of azygous side. 

 Fig. 6. Opposite view of same. 



Cyathocrinus blairi, n. sp 67 



Fig. 11. Basal view, azygous side up. 

 Fig. 12. A.zygous side view. 

 Fig. 13. Basal view of another specimen. 

 Fig. 14. Azygous side view of the same. 

 Fig. 15. Lateral view of same. 



Cyathocrinus chouteauensis, n. sp 68 



Fig. 16. View of a calyx and part of arms, azygous side on the right. 



Cyathocrinus macadamsi, n. sp 69 



Fig. 31. Calyx and part of arms, azygous side on the right. 

 Fig. 32. Lateral view of the same. 



Cyathocrinus brittsi, n. sp 70 



Fig. 35. Basal view of calyx. 

 Fig. 36. Azygous side of same. 



Platvcrinus tugurium, n. sp 70 



Fig. 17. Basal view. 



Fig. 18. Azygous side view. 



Fig. 19. Summit view. 



Platycrinus formosus, n. sp 72 



Fig. 20. Basal view. 



Fig. 21. Azygous side view. 



Platvcrinus missouriensis, n. sp 73 



Fig. 22. View of longer side. 

 Fig. 23. View of shorter side. 



Platycrinus pettisensis, n. sp 73 



Fig. 24. Basal view. 

 Fig. 25. Lateral view. 



Platycrinus clinatus, n. sp 74 



Fig. 26. Shorter side view. 



Fig. 27. Longer side view. 



Fig. 28. Longer side of another specimen. 



Fig. 29. Shorter side of same. 



Fig. 30. Longer side of another specimen. 



Platycrinus sulciperus, n. sp 75 



Fig. 33. Basal view. - 

 Fig. 34. Lateral view. 



Platycrinus casula, n. sp 76 



Fig. 37. Basal view . 



Fig. 38. Azygous side view. 

 Fig. 39. Opposite side of same. 

 Fig. 40. Summit view. 



Platycrinus sEMiPuaus, n. sp 77 



Fig. 41. Lateral view. 

 Fig. 42. Basal view . 



Platycrinus modestus, n. sp. 77 



Fig. 43. Lateral view. 

 Fig. 44. Basal view. 

 Fig. 45. Summit view. 



Platycrinus qermanus, n. sp 

 Fig. 46. Lateral view. 

 Fig. 47. Basal view. 



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