A slide of Surirella engleri var. warriensis from Victoria, Brazil. Two examples on the slide. No makers name but prepared by JA Long. Mounted in Hyrax. Slide is damaged. Olympus BHB microscope using 450nm LED light. Just managed to fit the two into the frame using to 40x objective, so these are shown as present on the slide. 40x Leitz Pl Apo 1.0 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 38 images stacked in Zerene (Pmax). Written about in Mills, F.W. (1932). Some Diatoms from Warri, South Nigeria. Journal of the Royal Microscopical Society, series 3, 52: 383-394, pl. 1-4. page(s): p. 393; pl. 4, fig. 50, 51.