Fig. 4
Poecilocrinus latealatus (Peck), upper Duck Creek Formation, Mortoniceras rostratum Zone (upper Albian); Saginaw Quarry, Fort Worth, Texas. Ontogenetic series of cups in aboral view. a M11564, b M11561, c M11548, d M11556, e M11560, f M11544, g M11554, h M11539, i M11555, j M11533, k M11537, l M11570, m 11536, n M11538, o M11545, p M11552, q M11558, r M11543, s M11541, t M11577