Here is a interesting Czech fossil plate from the Silurian of Lodenice.  The plate shows a large specimen of the classical Czech trilobite species Aulacopleura konincki. And a fossil Crinios crown of the species  Pisocrinus (Pisocrinus) pilula.
The Trilobite is about 19 mm long, the crinoids fossil measures about 14 mm.

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