Two examples of Coscinodiscus entoleion from Los Angeles, USA. Top label has been replaced at some point. Question mark after the location. Cover gauge 0.004” (0.10mm) – thin coverslip. Dated January 1894. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 31 images stacked in Zerene (Pmax).
Coscinodiscus entoleion Grunow 1888. Published in: Schmidt, A.[W.F.] (1888). Atlas der Diatomaceen-kunde. Series III: Heft 29/30 [“Heft 25”]. pp. pls. 113-120. Aschersleben: Commissions-Verlag von Ludwig Siever’s Buchhandlung. Plate 114, Figures 3,4.