Plate P1. 1. Amphymenium challengerae (Sample 183-1138A-12R-3, 20 cm) (scale bar = 80 µm). 2. Acrosphaera labrata (Sample 183-1138A-17R-1, 20 cm) (scale bar = 64 µm). 3. Acrosphaera australis (Sample 183-1138A-14R-3, 20 cm) (scale bar = 64 µm). 4-13. Cenosphaera sp. Keany. (4, 5) Sample 183-1138A-13R-3, 20 cm: (4) scale bar = 25 µm, (5) scale bar = 20 µm. 6-13. Cenosphaera sp. Keany (Sample 183-1138A-13R-1, 105 cm). (6, 7, 10-13) scale bar = 25 µm, (8, 9) scale bar = 80 µm.