150 



ECHINODERMA. BLASTOIDEA 



y Brachioles 



>■ Calyx 





V Stem 



J 



y Root 



Fig. 61. Orophocrinus fusiformis, from the Carboniferous of Iowa. 

 Restored figure. (From the Guide to the Geol. Dept., Brit. Mus.) 

 Natural size. 



