An arrangement of 20 forms, marine and freshwater, fossil and recent. Prepared by Northern Biological Supplies. Mounted in Hyrax. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo NA 0.45 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 4 images stacked in Zerene (Pmax).