Plate P10. 1–3. Thalassiosira cf. kolbei (JousÚ) Gersonde (Samples 191-1179C-18H-1, 75–77 cm [1], and 191-1179C-19H-1, 72–74 cm [2, 3]). 4. Thalassiosira leptopus (Grunow) Hasle and Fryxell—aberrant specimen (Sample 191-1179C-19H-6, 75–77 cm). 5, 6. Thalassiosira leptopus (Grunow) Hasle and Fryxell (Samples 191-1179C-19H-3, 75–77 cm [5], and 191-1179C-19H-5, 75–77 cm [6]). Scale bars = 10 Ám.