Mitrocystites mitra Barrande, 1887
Middle Ordovician (Llandeilo)
Sarka Formation
Rokycany, Barrandian area, Czech Republic
22mm carpoid in 51mm half-concretion.

Mitrocystites is a genus of carpoid known from the Ordovician to Devonian of Europe.

Carpoids are an extinct group that most paleontologists consider to be early echinoderms while others maintain they could be primitive chordates.

Nice piece that would fit nicely in your display case or specimen drawer. You need something from the Czech Republic anyway.

What is a carpoid? This article explains them (PDF)