70 OWEN AND SHUMARD'S FOSSIL CRINOIDEA 



EXPLANATION OF PLATE VII. 



Fig. 1. Platycrinus discoideus. 



" a. Basal view. 



" b. Side view, showing the form of the articulating surface for the arms. 



Fig. 2. Platycrinus corrugatus. 



" a. Basal view with several joints of column attached. 



" b. Side view showing the form of the first cuneiform joint of the arms. 



" c. Detached scapular plate. 



" d. " basal plate. 



" e. Scapular plate enlarged showing the corrugated surface. 



Fig. 3. ACTINOCRINUS EVANSII. 



" a. Side view of the body, natural size. 



" b. Basal aspect, showing the form of the basal and first series of plates. 



Fig. 4-. Platycrinus planus. 



" a. View of the face of a specimen of medium size. 



" b. View of a large specimen from Burlington, Iowa. 



*' c. Detached basal plate. 



Fig, 5. Platycrinus Burlingtonensis. 



Fig. 6. Platycrinus Yandellii. 



" a. Side view. 



" b. Basal view. 



Fig. 8. Cyathocrinus cornutus. 



" a. Side view. 



" b. Basal aspect. 



Fig. 9. DiCHOCRINUS OVATUS. 



" a. View of the face exhibiting a fragment of an arm attached to one of the superior plates. 



" b. Basal plate exhibiting its bi-partite character. 



Fig. 10. DiCHOCRINUS STRIATUS. 



" a. View of the side showing the longitudinal striae running over the surface of the plates. 



*' b. Basal plate exhibiting the division. 



Fig. 11. Cyathocrinus Iowensis. 

 " a. Basal aspect. 



" View of the side. 



" c. detached superior plate showing the corrugated surface. 



Fig. 12. ACTINOCRINUS UNICORNUS. 



" a. Basal view. 



" b. Side view, exhibiting the position of the mouth, and the central spinous capital plate. 



Fig. 13. Pentremites Norwoodii. 



" a. Basal view. 



" b. View of the summit. 



" c. View of the side. 



Fig. 14. Pentremites melo. 



" a. View of the summit exhibiting the aperturei. 



" b. Basal view. 



" c. Side view. 



Fig. 15. Pentremites laterniformis. 

 Fig. 16. Pentremites stelliformis. 



" a. View of the summit exhibiting its star like contour and the oral aperture. 



" b. Side view. 



