Plate P2. 1. Thalassiosira lineata Jousé (Sample 185-1149A-1H-1, 61-63 cm) 2. Thalassiosira oestrupii (Ostenfeld) Proshkina Lavrenko (Sample 185-1149A-10H-6, 135-141 cm). 3. Thalassiosira plicata Schrader (Sample 185-1149A-10H-5, 111-113 cm). 4. Thalassiosira symbolophora Koizumi and Tanimura (Sample 185-1149A-11H-6, 140-146 cm). 5. Thalassiosira symmetrica (Sample 185-1149A-8H-3, 54-56 cm). 6. Thalassiosira trifulta Fryxell (Sample 185-1149A-8H-3, 54-56 cm). 7. Thalassiosira species A (Sample 185-1149A-8H-4, 72-74 cm). Scales bars = 10 µm.