Triceratium kinkerianum from William’s Bluff, Oamaru. There is faint pencil writing which says ‘inverted’ and this has the rim towards the coverslip (underside facing upwards). Single example on the slide. Desikachary and Sreeltha have the alternative name for this as Trigonium glandiferum. Prepares name sticker is worn but this is by HJ Baker (likely Henry James Baker, see the Microscopist.net page here). Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 81 images stacked in Zerene (Pmax).