Page 



Ptekotockixus ckassus Meek aud 'Worlhcn 801 



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



Pterotocrinus acutus, var. bifurcatus Wetherby 801 



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



9b. Ventral aspect of the same. 



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



