Plate P1. Helicosphaeraceae, Pontosphaeraceae, Noelaerhabdaceae, Reticulofenestra. 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. Helicosphaera carteri (Sample 198-1208A-8H-CC). 2. Helicosphaera granulata (Section 198-1208A-34X-5). 3, 4. Helicosphaera inversa (Sample 198-1208A-3H-CC). 5, 6. Helicosphaera sellii (Section 198-1208A-13H-5). 7, 8. Pontosphaera discopora; (7) Sample 198-1208A-9H-CC, (8) Section 198-1208A-2H-5. 9. Pontosphaera multipora (Sample 198-1208A-18H-CC). 10. Syracosphaera pulchra (Sample 198-1208A-8H-CC). 11. Rhabdosphaera clavigera (Section 198-1208A-1H-4). 12. Calciosolenia brasiliensis (Section 198-1208A-1H-4). 13. Cyclicargolithus ?abisectus (11.4 µm) (Sample 198-1208A-32X-CC). 14–17. Cyclicargolithus floridanus; (14) 10.1 µm (Sample 198-1208A-27X-CC), (15) 9.3 µm (Sample 198-1208A-32X-CC), (16) 7.5 µm (Sample 198-1208A-32X-CC), (17) Sample 198-1208A-35X-CC. 18. Reticulofenestra bisecta (10.6 µm) (Sample 198-1208A-35X-CC). 19. Small reticulofenestrids (~1.7 µm) (Sample 198-1208A-18H-CC). 20. Reticulofenestra minuta (2.8 µm) (Sample 198-1208A-5H-CC). 21–25. Reticulofenestra haqii; (21) 3.1 µm (Sample 198-1208A-18H-CC), (22) 4 µm (Sample 198-1208A-27X-CC), (23) 4.3 µm (Sample 198-1208A-16H-CC), (24) 4.1 µm (Sample 198-1208A-14H-CC), (25) 4.7 µm (Sample 198-1208A-9H-CC). 26, 27. Reticulofenestra haqii-asanoi; (26) 5.4 µm (Core 198-1208A-7H), (27) 6.3 µm (Sample 198-1208A-6H). 28, 29. Reticulofenestra asanoi; (28) 6.6 µm (Sample 198-1208A-6H-CC), (29) 6.8 µm (Section 198-1208A-6H-5). 30. Reticulofenestra rotaria (Section 198-1208A-25X-4). 31–37. Reticulofenestra pseudoumbilicus; (31) 5.0 µm (Sample 198-1208A-27X-CC), (32) 6.1 µm (Sample 198-1208A-26X-CC), (33) 6.9 µm (Sample 198-1208A-26X-CC), (34) 7.8 µm (Sample 198-1208A-19H-CC), (36) 11.5 µm (Sample 198-1208A-28X-CC), (37) 9.2 µm with grill (Sample 198-1208A-18H-CC). 38, 39. Pseudoemiliania lacunosa; (38) Sample 198-1208A-16H-CC, (39) Sample 198-1208A-4H-CC. 40. Pseudoemiliania ovata (Sample 198-1208A-9H-CC). 41, 42. Emiliania huxleyi (Section 198-1208A-1H-4). (Plate shown on next page.)

Plate P1. Helicosphaeraceae, Pontosphaeraceae, Noelaerhabdaceae, Reticulofenestra. 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. Helicosphaera carteri (Sample 198-1208A-8H-CC). 2. Helicosphaera granulata (Section 198-1208A-34X-5). 3, 4. Helicosphaera inversa (Sample 198-1208A-3H-CC). 5, 6. Helicosphaera sellii (Section 198-1208A-13H-5). 7, 8. Pontosphaera discopora; (7) Sample 198-1208A-9H-CC, (8) Section 198-1208A-2H-5. 9. Pontosphaera multipora (Sample 198-1208A-18H-CC). 10. Syracosphaera pulchra (Sample 198-1208A-8H-CC). 11. Rhabdosphaera clavigera (Section 198-1208A-1H-4). 12. Calciosolenia brasiliensis (Section 198-1208A-1H-4). 13. Cyclicargolithus ?abisectus (11.4 µm) (Sample 198-1208A-32X-CC). 14–17. Cyclicargolithus floridanus; (14) 10.1 µm (Sample 198-1208A-27X-CC), (15) 9.3 µm (Sample 198-1208A-32X-CC), (16) 7.5 µm (Sample 198-1208A-32X-CC), (17) Sample 198-1208A-35X-CC. 18. Reticulofenestra bisecta (10.6 µm) (Sample 198-1208A-35X-CC). 19. Small reticulofenestrids (~1.7 µm) (Sample 198-1208A-18H-CC). 20. Reticulofenestra minuta (2.8 µm) (Sample 198-1208A-5H-CC). 21–25. Reticulofenestra haqii; (21) 3.1 µm (Sample 198-1208A-18H-CC), (22) 4 µm (Sample 198-1208A-27X-CC), (23) 4.3 µm (Sample 198-1208A-16H-CC), (24) 4.1 µm (Sample 198-1208A-14H-CC), (25) 4.7 µm (Sample 198-1208A-9H-CC). 26, 27. Reticulofenestra haqii-asanoi; (26) 5.4 µm (Core 198-1208A-7H), (27) 6.3 µm (Sample 198-1208A-6H). 28, 29. Reticulofenestra asanoi; (28) 6.6 µm (Sample 198-1208A-6H-CC), (29) 6.8 µm (Section 198-1208A-6H-5). 30. Reticulofenestra rotaria (Section 198-1208A-25X-4). 31–37. Reticulofenestra pseudoumbilicus; (31) 5.0 µm (Sample 198-1208A-27X-CC), (32) 6.1 µm (Sample 198-1208A-26X-CC), (33) 6.9 µm (Sample 198-1208A-26X-CC), (34) 7.8 µm (Sample 198-1208A-19H-CC), (36) 11.5 µm (Sample 198-1208A-28X-CC), (37) 9.2 µm with grill (Sample 198-1208A-18H-CC). 38, 39. Pseudoemiliania lacunosa; (38) Sample 198-1208A-16H-CC, (39) Sample 198-1208A-4H-CC. 40. Pseudoemiliania ovata (Sample 198-1208A-9H-CC). 41, 42. Emiliania huxleyi (Section 198-1208A-1H-4).