The 100 µm scale bar applies to figs. 1-5;
the 10 µm scale bar applies to figs. 6 and 7.
Figs. 1-7. Hexacontium hexacanthum. Note considerable differences in size and thickness of the shell (cp. also with Pl. 32, figs. 1 and 2). Fig. 1: Specimen with rare clove-like spine termination (1 spec. only). Figs. 2 and 7: Originally complete specimens, broken open to reveal medullary shells. Fig. 5a: focus on medullary shells; fig. 5b: focus on cortical shell. BSS 28B(II/670), (11/670), 28B(II), 28B(VIT/1440), 19B(F) EF B48, 28B(VII/1432) and 28B(III/453). See also detail of cortical shell of fig. 3 on Pl. 38, rig. 2.