RETEOCRINID^. 187 



them narrower above than below ; the succeeding ones are a httle smaller 

 than the costals. Ventral disk not visible in the specimens. Column com- 

 paratively large and obscurely pentagonal, the nodal joints larger, and with 

 slightly undulating edges. 



Horizon and Locality/, — Upper part of the Hudson River group, Warren 

 Co., 0. 



The type specimens, w4iich are in our collection, were presented to us by 

 Dr. S. S. Scoville of Lebanon. 



