Plate P2. Magnification for light micrography is 2200x; magnification is indicated on electron micrography (SEM) specimens. Light micrography: PH = phase-contrast light, PL = plain transmitted light, XP = cross-polarized light. 1. Placozygus sigmoides, Sample 173-1068A-11R-3, 70-73 cm, SEM. 2. Coccolithus pelagicus, Sample 173-1068A-11R-3, 70-72 cm, SEM. 3. Toweius tovae, Sample 173-1068A-11R-3, 70-72 cm, SEM. 4. Toweius eminens, Sample 173-1068A-11R-3, 70-72 cm, SEM. 5. Neochiastozygus perfectus(?), Sample 173-1068A-11R-3, 70-72 cm, SEM. 6, 7. Fasciculithus tympaniformis, Sample 173-1068A-11R-3, 70-72 cm, PL (6) and XP (7). 8-10. Discoaster bramletteii, Sample 173-1068A-11R-2, 118-120 cm, PL (8), XP (9), and PH (10). 11-13. Heliolithus kleinpellii, Sample 173-1068A-10R-3, 123-125 cm, PH (11), PL (12), and XP (13). Click on image for close-up.