Plate P3. Magnification for light micrography is 2200x. Light micrography: PH = phase-contrast light, PL = plain transmitted light, XP = cross-polarized light, SEM = scanning electron micrography. 3, 4. Prediscosphaera cretacea, Sample 173-1068A-15R-3, 34-35 cm, PH (3) and XP (4).