Plate 5. Interference contrast microscope photographs of selected dinocysts. AGC duration and England Finder references in parentheses. HI, MID, LO are focal planes. 1. Impagidinium aspinatum: Sample 898A-28X-2C, 58-60 cm; MID ×730 (941123, W15/1). 2. Thalassiphora pelagica: Sample 898A-28X-2C, 16-18 cm; HI ×29 (941124). 3, 4. Sample 900-18R-2, 58-60 cm. 3. Pyxidiella? simplex; MID ×730 (940913, Y30/1). 4. Spiniferites mirabilis; MID (940987, X20/0). 5, 6. Sample 898A-18R-CC. Bitectatodinium tepikiense; 5. MID, ×292. 6. HI, ×730. 7. Operculodinium janduchenei: Sample 898A-28X-2B, 58-60 cm; HI ×292 (950929, M17/3). 8. Habibacysta tectata: Sample 898A-1R-CC; MID ×730 (951308, K22/0). 9. Impagidinium bacatum: Sample 900A-16R-5, 81-83 cm; HI (941208, X41/4). 10. Habibacysta tectata: Sample 898A-19X-1, 40-42 cm; MID ×730 (951314, F18/0).