Stems up to a meter in length. Shape shown is consistent through most of that lengh.
Shape changes to pentagonal near the cup.
Merocrinus Round very smooth stems found in the lower Kope. Merocrinus Stems Photo Ectenocrinus simplex One of the most common stems found in the Kope and into the Maysvillian. Stems up to a meter long. The stem changes below the cup rapidly tapering with very thin columnals. Gaurocrinus nealli Stem is pentagonal with very rounded corners.