Auliscus grunovii fossil marine diatom from Palos Verdes, California. Single example on the slide. Prepared by ECP Bone. Mounted in Hyrax and dated 1963. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 34 images stacked in Zerene (Pmax).