Plate P10. Scale bar = 10 µm. 1-3. Cryptococcolithus mediaperforatus (Sample 189-1170A-23X-3, 60 cm); (1) phase-contrast light (Ph); (2) differential-interference contrast light (DIC); (3) polarized light (XP). 4-6. Umbilicosphaera jafari (Sample 189-1168A-47X-2, 120 cm); (4) Ph; (5) DIC; (6) XP. 7-9. Pyrocyclus orangensis (Sample 189-1168A-46X-7, 40 cm); (7) Ph; (8) DIC; (9) XP. 10. Pyrocyclus hermosus (Sample 189-1172A-35X-1, 18 cm) (XP). 11, 12. Tetralithoides symeonidesii (Sample 189-1168A-37X-5, 15 cm); (11) DIC; (12) XP.