Carabocrinus vancortlandti Ordovician Bobcaygeon Formation Brechin, Ontario, Canada This plate has two specimens of Carabocrinus,and many Periglyptocrinus. Size: This large slab was used the publications on the Brechin crinoids. It is currently deposited at the University of Michigan. One of the Periglyptocrinus on this slab is a holotype.