Cerataulus subangulatus from Oamaru, New Zealand. Single example on the slide, facing upwards (with the rim furthest away from coverslip). Prepared by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 76 images stacked in Zerene (Pmax).