Pleurocystites squamosus Glyptocystites multiporus Amecystis laevis Cupulocrinus humilis CYSTOIDS and CRINOID Ordovician Bobcaygeon Fm. Brechin, Ontario, Canada Size: 34 cm. or 13.5 inches across the slab All three cystoids found at this locality appear on the slab. The Amecystis is only a small portion of a cystoid, but present. Price: $250 US ID number: f1383