Plate P4. Magnification for light micrography is 2200x; magnification for scanning electron micrography (SEM) specimens is indicated. Light micrography: PH = phase-contrast light, PL = plain transmitted light, XP = cross-polarized light. 8-10. Eiffellithus turriseiffelii, Sample 173-1068A-14R, 121-122 cm, PH (8) and XP (9, 10).