An arrangement of different diatoms from Monterey, California, USA. Labelled as ‘Amphitetras’ but there is a variety of different species and genus here. Prepared by Arthur Charles Cole. Olympus BHB microscope using 450nm LED light. As well as the whole arrangement, I imaged four of them using a 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oblique lighting.2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 38 images stacked in Zerene (Pmax).