FIGURES 22–24. 22 in Studies on type material from Kützing's diatom collection VI:The identity of Diatoma liber Suhr (1831)

FIGURES 22–24. 22. Reproduction of Kützing's drawing of Biddulphia trilocularis (Kützing 1844, p. 138, pl. 29, fig. 89), possibly a reproduction or re-drawing of Ehrenberg's Denticella biddulphia (compare with Figs 23 and 24). 23, 24. Reproduction of Ehrenberg's Denticella biddulphia (Ehrenberg 1843, Taf. II, vi, fig. 19, 'Cuba', Fig. 23 = published drawing, Fig. 24 = unpublished drawing; none of the original illustrations have scales, the reproductions here are approximately the same size as that in the original)