Auliscus elegans from Conset, Barbados. Single example on the slide. Fossil marine material. Mounted in Styrax and dated December 1968. Very nice and clear mountant. Prepared by RI Firth. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 45 images stacked in Zerene (Pmax).
Aulacodiscus elegans Grove & Sturt, 1887. Original description: 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. Pages 140, 146, Plate 12, Figure 30.
There is also another description of A. elegans. Auliscus elegans Greville 1863. Published in: Greville, R.K. (1863). A monograph of the genus Auliscus. Transactions of the Microscopical Society, New Series, London 11: 36-53, pls II, III. Page 45, Plate 2[II], Figure 8.