The vertical 100 Ám scale bar of fig. 5 applies to figs. 1-3 as well; fig. 4 has its own scale bar.
Fig. 1, 2, 5. Cladococcus abietinus. Note conical pores, esp. in figs. I and 2, and slight twisting of arms (e.g. fig. 5, bottom) BSS 54B(F), BSS 61B(F) EF D38 and BSS 28B(IX/1313).
Fig. 3. Cladococcus arborescens (accompanied by C. macropora, at lower left). IOW 158(F).
Fig. 4. Diplosphaera lychnosphaera, with fully developed second, arborescent, cortical shell. BSS 28B(IX/1332). See also Pl. 21 figs. 3, 4.