Plate P3. Scale bar = 10 µm. 1A-1C. Chiasmolithus danicus (Sample 183-1135A-27R-3, 96-97 cm); (1A) differential interference contrast light (DIC), (1B) transmitted light, (1C) crossed polarizers. 2A-2C. Prinsius bisulcus (Sample 183-1135A-27R-3, 96-97 cm); (2A) DIC, (2B) transmitted light, (2C) crossed polarizers. 3A, 3B. Prinsius martinii (Sample 183-1135A-27R-3, 96-97 cm; crossed polarizers). 4. Nannotetrina fulgens (Sample 183-1138A-44R-4, 25-26 cm; transmitted light).

Plate P3. Scale bar = 10 µm. 1A-1C. Chiasmolithus danicus (Sample 183-1135A-27R-3, 96-97 cm); (1A) differential interference contrast light (DIC), (1B) transmitted light, (1C) crossed polarizers. 2A-2C. Prinsius bisulcus (Sample 183-1135A-27R-3, 96-97 cm); (2A) DIC, (2B) transmitted light, (2C) crossed polarizers. 3A, 3B. Prinsius martinii (Sample 183-1135A-27R-3, 96-97 cm; crossed polarizers). 4. Nannotetrina fulgens (Sample 183-1138A-44R-4, 25-26 cm; transmitted light).