The topmost (100 µm) scale bar applies to figs. 4, 7 and 9;the one in the center (10 µm) applies to figs. 1-3, 5 and 6; and the lowermost (10 µm) bar applies to figs. 8a and b.
Fig. 1. Collosphaera sp. showing intermediate characteristics between C. huxleyi (forma glebulenta) and C. macropora (forma polygona). BSS 28B(VIII/1042).
Figs. 2, 5. Collosphaera macropora forma polygona. BSS 38B(F) EF W47,2 and BSS 28B(VIII/770).
Fig. 3. Collosphaera macropora forma cyrtodon. BSS 28B(VIII/960).
Fig. 4. Collosphaera huxleyi forma glebulenta. BSS 28B(IX/1001).
Fig. 6. Collosphaera armata. BSW P97, th.2(VIII/904).
Fig. 7. Sphaerozoum punctatum. BSS 28B(IX/1314).
Figs. 8a,b. Comparison between the thin perforate plate shell of M. magnisphaera (fig. 8a; complete specimen in Pl. 11 fig. 8) and a simple, irregular bubbleframe with rounded bars (of D. messanensis fig. 8b).