Four diatoms from Forrester’s Hill, Oamaru, New Zealand. Auliscus oamaruensis, hardmanianus and ovalis, Monopsia mammosa. Mounted in Styrax and dated 1949. Slide is slightly oversized, being more than 25mm across. Prepared by CL Odam. Olympus BHB microscope using 450nm LED light. As well as the arrangement, I imaged two with the 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. Images stacked in Zerene (Pmax).
Monopsia mammosa 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 142, Plate XIII, Figure 38. 63 images stacked. Underside view with the rim upwards. Dipping downwards towards the left hand side.
Auliscus ovalis Arnott 1861. Published in: Pritchard, A. (1861). A history of infusoria, including the Desmidiaceae and Diatomaceae, British and foreign. Fourth edition enlarged and revised by J. T. Arlidge, M.B., B.A. Lond.; W. Archer, Esq.; J. Ralfs, M.R.C.S.L.; W. C. Williamson, Esq., F.R.S., and the author. pp. [1]-xii, [1]-968, 40 pls [I-XV]. London: Whittaker and Co.. Page 846. See also Schmidt’s Atlas Plate 149, Figure 4, where it is referred to as Auliscus ellipticus. Schmidt describes this as ‘related’ to A. ovalis Arnott. This also explains the note on the label which says “ellipticus per Schmidt’s Atlas Plate 149, Figure 4.”. 41 images stacked.