Plate P4. Scale bars = 10 µm. 1, 6. Sample 183-1140A-20R-2, 100-102 cm; (1) Asteromphalus oligocenicus, (6) Rocella vigilans var. a. 2-5, 7, 8. Sample 183-1140A-21R-3, 25-27 cm; (2, 3) Stephanopyxis turris, (4) Stephanopyxis barbadensis, (5) Rocella praenitida, (7) Pseudorocella barbadensis, (8) Pseudotriceratium chenevieri.