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. 8-10. Discoaster bramletteii, Sample 173-1068A-11R-2, 118-120 cm, PL (8), XP (9), and PH (10).