Amphipleura lindheimeri. Four examples on the slide. No location given, no mountant information and no maker details. Olympus BHB microscope using 365nm UV light from a 50w Zeiss HBO mercury xenon lamp. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Abbe condenser, iris slightly closed down, oil immersion. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 4 images stacked in Zerene (Dmap). Striae distance 377nm, and puncta distance 409nm measured in ImageJ.