Plate P8. Scale bar = 10 µm. 1-3. Sphenolithus heteromorphus (Sample 189-1172A-31X-4, 15 cm); (1) differential-interference contrast light (DIC); (2, 3) polarized light (XP). 4-7. Sphenolithus dissimilis (Sample 189-1172A-35X-1, 18 cm); (4) phase-contrast light (Ph); (5) DIC; (6, 7) XP. 8-11. Sphenolithus disbelemnos (Sample 189-1168A-33X-4, 15 cm); (8) Ph; (9) DIC; (10, 11) XP. 12. Sphenolithus capricornutus (Sample 189-1168A-47X-2, 120 cm) (XP).

Plate P8. Scale bar = 10 µm. 1-3. Sphenolithus heteromorphus (Sample 189-1172A-31X-4, 15 cm); (1) differential-interference contrast light (DIC); (2, 3) polarized light (XP). 4-7. Sphenolithus dissimilis (Sample 189-1172A-35X-1, 18 cm); (4) phase-contrast light (Ph); (5) DIC; (6, 7) XP. 8-11. Sphenolithus disbelemnos (Sample 189-1168A-33X-4, 15 cm); (8) Ph; (9) DIC; (10, 11) XP. 12. Sphenolithus capricornutus (Sample 189-1168A-47X-2, 120 cm) (XP).