Plate P1. Scale bar = 10 µm. 1A-1B. Discoaster multiradiatus (Sample 183-1135A-26R-2, 25-26 cm); (1A) differential interference contrast light (DIC), (1B) transmitted light. 1C. Sample 183-1135A-25R-1, 25-26 (scanning electron microscope [SEM]). 2A, 2B. Fasciculithus magnicordis (Sample 183-1135A-26R-2, 25-26 cm); (2A) DIC, (2B) crossed polarizers. 3A-3C. Neochiastozygus junctus (Sample 183-1135A-26R-2, 25-26 cm; (3A) DIC, (3B) transmitted light, (3C) crossed polarizers. 3D. Neochiastozygus junctus (Sample 183-1135A-25R-1, 25-26 cm; SEM).