Aulacodiscus janischii from Oamaru, New Zealand. Single example on the slide. I think this might be by W Gardner (see the W.G. initials on the slide). More on this in a minute. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 76 images stacked in Zerene (Pmax).
Aulacodiscus janischii Grove & Sturt 1887. Published in: Grove, E. & Sturt, G. (1887). On a fossil marine diatomaceous deposit from Oamaru, Otago, New Zealand. Appendix. Journal of the Quekett Microscopical Club, Series 2 3(19): 131-148, pls 10-14. Page 139, Plate 11, Figure 28.
Back to the maker. I have a few slides of similar style (some of handwriting, some of the ring around the coverslip), and one of these is named W. Gardner (see below).
