Triceratium crenulatum, WA Firth(?)

Triceratium crenulatum
Triceratium crenulatum arrangement, 20x Nikon Plan Apo NA 0.65 objective

Triceratium crenulatum arrangement of three diatoms from Bain’s Farm, Oamaru, New Zealand. There is no makers name on the label however it is very similar to slides by WA Firth, although Barbour brothers ones are also very similar. For now I’ve put it down as WA Firth but with a question mark. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.40 objective, oil immersion for the main image. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 18 images stacked in Zerene (Pmax).