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Pteeotockinus ckassus Meek and "Worthen 801 



Fig. 8. Posterior view of the type specimen. (After Meek and Worthen.) 



Ptekotocrinus acutus, var. bifuecatus "Wetherby 801 



9a. Dorsal aspect of the type specimen. (After Wetherby.) 



%. Ventral aspect of the same. 



10. Diagram, showing the arrangement of tlie lower brachials in Pterotocrinus. 



