Plate P24. Diatoms from shelf sites: Thalassiosira and others. 1-3. Sample 178-1100D-2R-CC. (1) Thalassiosira antarctica,(2) Thalassiosira gracilis, (3) Fragilariopsis kerguelensis. 4. Thalassiosira lentiginosa (Sample 178-1103A-6R-CC). 5-9. Sample 178-1103A-10R-CC. (5) Stellarima spp., (6) Thalassiosira torokina, (7) Thalassiosira spp. (8) Actinocyclus karstenii, (9) Thalassiothrix antarctica.