Pleurosigma olympianum from Puget Sound. 2 examples on the slide. Prepared by Herbert William Hutton Darlaston. Olympus BHB microscope using 450nm LED light. Main image with a 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. 19 images stacked in Zerene (Pmax).