Cocconeis sp?, Samuel Meakin

Cocconeis sp?, top and bottom valves?

Cocconeis sp?, top and bottom valves? from Commonwealth Bay. Rather rare. Prepared by SH Meakin. Mounted in Sirax, September 1943. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, bright field lighting. 2.5x Nikon CF PL photoeyepiece, removed 11mm of tube spacer to increase field of view. Monochrome converted Nikon d850 camera. 17 images stacked in Zerene (Pmax). It seems as though Meakin had some questions about the species and whether these show the top and bottom of the diatom valves.