Plate P2. Gephyrocapsa, Coccolithaceae, Calcidiscaceae. Taxonomic organization and concepts are generally comparable to those of Young and Bown (1997) and Young (1998). Images with black background are cross-polarized light images; those with light backgrounds are phase-contrast images. 1–6. Gephyrocapsa (small); (1) 1.4 µm (Sample 198-1208A-2H-CC), (2) 2.1 µm (Sample 198-1208A-9H-CC), (3) 2.1 µm (Sample 198-1208A-18H-CC), (4) 2.8 µm (Sample 198-1208A-5H-CC), (5) 2.9 µm (Sample 198-1208A-4H-CC), (6) 2.9 µm (Sample 198-1208A-3H-CC). 7–12. Gephyrocapsa (medium); (7–10) G. oceanica, (7) 3.8 µm (Sample 198-1208A-4H-CC), (8) 3.8 µm (Sample 198-1208A-2H-CC), (9) 3.8 µm (Sample 198-1208A-1H-CC), (10) 4.4 µm (Sample 198-1208A-2H-CC), (11, 12) G. caribbeanica, (11) 4.1 µm (Sample 198-1208A-8H-CC), (12) 4.3 µm (Sample 198-1208A-8H-CC). 13–15. Gephyrocapsa (large); (13) G. caribbeanica, 5.0 µm (Sample 198-1208A-8H-CC), (14, 15) G. oceanica, (14) 5.1 µm (Sample 198-1208A-8H-CC), (15) 5.6 µm (Sample 198-1208A-1H-1). 16–18. Gephyrocapsa omega; (16) 5.2 µm (Sample 198-1208A-1H-CC), (17) 5.0 µm (Sample 198-1208A-5H-CC), (18) 5.3 µm (Sample 198-1208A-4H-CC). 19–22. Coccolithus pelagicus; (19, 20) Sample 198-1208A-30X-CC, (21, 22) Sample 198-1208A-19H-CC. 23, 24. Coccolithus miopelagicus (15.1 µm) (Sample 198-1208A-31X-CC). 25–28. Calcidiscus leptoporus; (25) Sample 198-1208A-14H-CC, (26, 27) 6.3 µm (Sample 198-1208A-27X-CC), (28) 8.8 µm (Sample 198-1208A-24X-CC). 29–33. Calcidiscus tropicus; (29, 30) 8.7 µm (Sample 198-1208A-13H-CC), (31) 8.8 µm (Sample 198-1208A-21X-CC), (32) 8.9 µm (Sample 198-1208A-32X-CC), (33) 7.8 µm (Sample 198-1208A-18H-CC). 34–38. Calcidiscus macintyrei; (34, 35) 11.2 µm (Sample 198-1208A-32X-CC), (36) 11.7 µm (Sample 198-1208A-26X-CC), (37, 38) 11.2 µm (Sample 198-1208A-24X-CC). 39–42. Calcidiscus premacintyrei; (39) Sample 198-1208A-33X-CC, (40, 41) 11.2 µm (Sample 198-1208A-32X-CC), (42) 11.5 µm (Sample 198-1208A-31X-CC). (Plate shown on next page.)

Plate P2. Gephyrocapsa, Coccolithaceae, Calcidiscaceae. Taxonomic organization and concepts are generally comparable to those of Young and Bown (1997) and Young (1998). Images with black background are cross-polarized light images; those with light backgrounds are phase-contrast images. 1–6. Gephyrocapsa (small); (1) 1.4 µm (Sample 198-1208A-2H-CC), (2) 2.1 µm (Sample 198-1208A-9H-CC), (3) 2.1 µm (Sample 198-1208A-18H-CC), (4) 2.8 µm (Sample 198-1208A-5H-CC), (5) 2.9 µm (Sample 198-1208A-4H-CC), (6) 2.9 µm (Sample 198-1208A-3H-CC). 7–12. Gephyrocapsa (medium); (7–10) G. oceanica, (7) 3.8 µm (Sample 198-1208A-4H-CC), (8) 3.8 µm (Sample 198-1208A-2H-CC), (9) 3.8 µm (Sample 198-1208A-1H-CC), (10) 4.4 µm (Sample 198-1208A-2H-CC), (11, 12) G. caribbeanica, (11) 4.1 µm (Sample 198-1208A-8H-CC), (12) 4.3 µm (Sample 198-1208A-8H-CC). 13–15. Gephyrocapsa (large); (13) G. caribbeanica, 5.0 µm (Sample 198-1208A-8H-CC), (14, 15) G. oceanica, (14) 5.1 µm (Sample 198-1208A-8H-CC), (15) 5.6 µm (Sample 198-1208A-1H-1). 16–18. Gephyrocapsa omega; (16) 5.2 µm (Sample 198-1208A-1H-CC), (17) 5.0 µm (Sample 198-1208A-5H-CC), (18) 5.3 µm (Sample 198-1208A-4H-CC). 19–22. Coccolithus pelagicus; (19, 20) Sample 198-1208A-30X-CC, (21, 22) Sample 198-1208A-19H-CC. 23, 24. Coccolithus miopelagicus (15.1 µm) (Sample 198-1208A-31X-CC). 25–28. Calcidiscus leptoporus; (25) Sample 198-1208A-14H-CC, (26, 27) 6.3 µm (Sample 198-1208A-27X-CC), (28) 8.8 µm (Sample 198-1208A-24X-CC). 29–33. Calcidiscus tropicus; (29, 30) 8.7 µm (Sample 198-1208A-13H-CC), (31) 8.8 µm (Sample 198-1208A-21X-CC), (32) 8.9 µm (Sample 198-1208A-32X-CC), (33) 7.8 µm (Sample 198-1208A-18H-CC). 34–38. Calcidiscus macintyrei; (34, 35) 11.2 µm (Sample 198-1208A-32X-CC), (36) 11.7 µm (Sample 198-1208A-26X-CC), (37, 38) 11.2 µm (Sample 198-1208A-24X-CC). 39–42. Calcidiscus premacintyrei; (39) Sample 198-1208A-33X-CC, (40, 41) 11.2 µm (Sample 198-1208A-32X-CC), (42) 11.5 µm (Sample 198-1208A-31X-CC).