208 PALAEONTOLOGY OF ILLINOIS. 



face. There is no anal plate, and nothing is known of the anal 

 aperture nor of the summit structure. 



Column small, round; axial canal pentangular, the angles 

 directed interradially. 



Geological position, etc. From the age of the Niagara group 

 of Eastern Tennessee. The original is from the collection of 

 Prof. A. H. Worthen, and was found by him at Clifton, Wayne 

 Co., Tenn. 



