Figures

Figure 15.3   Some crinoid ossicle types. (a) Articular facet of a columnal of the bourgueticrinid Democrinus (?) sp., with a fulcral ridge of the synarthrial articulation; the lumen opens at the bottom of the 8-shaped depression (15). (b) Cirral scar on a nodal of the isocrinoid Neocrinus with well-preserved stereom microstructure and knob-like synarthrial fulcrum (18). (c) Articular facet of a columnal of the isocrinoid Neocrinus with symplectial articulation around the fi ve petal-like areola areas (9). (Courtesy of Stephen Donovan.)

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