FIGURES 36–40 in Notes on the diatom collection of the Natural History Museum, London (BM) VII: An account of some original specimens of Pyrgodiscus (Bacillariophyta) with notes on Stephanogonia (Bacillariophyta)

FIGURES 36–40. Stephanogonia sp. SEM (All from "Japan 2019"). 36, 37. Whole valve to show spines at the top of the pillar linking with the remaining part of the valve. 38. Reproduced from Pantocsek 1889: pl. 9, fig. 161, "Szakal", Hungary, of Stephanogonia cincta. 39, 40. Detail Of the spine strUctUre (Fig. 39) and central part Of pillar (Fig. 40). Scale bars = 15 μm (Figs 36–7), 6 μm (Figs 39–40).