The 100 Ám scale bar applies to all figs.
except fig. 2b, which has its own scale bar.
Figs. 1-3. Spongodrymus cubocentron. Fig. 1: form without main spines but with numerous by-spines. Fig. 2b: detail of microsphere, with cylindrical, arched bars. Fig. 3a focussed on shell wall, 3b on central structure. RSW 84(F), BSS 28B(VII/1570) and BSS 25B(F) EF G41.