CRINOIDS AND BLASTOIDS. 185 



Surface of the plates granular, but otherwise devoid of orna- 

 mentation: suture lines indistinct. 



Column small, rounded, with a small axial canal. The specific 

 name is in honor of Dr. W. B. Waters, of Marshalltown. Iowa. 



Geological position, etc.: Kinderhook beds of the lower carbon- 

 iferous. LeGrand. Iowa. 



Our own collection. 



23 



