Triceratium rugosum from Williams’s Bluff, Oamaru. Single example on the slide. Prepared by HJ Baker (likely Henry James Baker, see the Microscopist.net page here). Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 115 images stacked in Zerene (Pmax).