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This scientific plate provides a detailed look at the complex skeletal anatomy of a sea-lily, a sedentary marine echinoderm. The primary figure on the left illustrates the complete "crown" of the organism, consisting of a cup-shaped calyx at the base that supports numerous bifurcating, segmented arms used for filtering nutrients from the water. A short portion of the articulated, screw-like attachment stem is visible at the very bottom. To the right, a tall, tapering structure showcases the "proboscis" or anal tube, which is composed of a dense mosaic of interlocking hexagonal plates. Additionally, a small oval diagram provides a face-on view of a single stem joint, revealing a central canal and the specialized ridges that allowed the column to remain flexible yet robust. These fossils are hallmark representatives of the flourishing echinoderm populations that inhabited the clear, shallow seas of the Lower Carboniferous period.