Plate P26. Diatoms from shelf sites: Actinocyclus and Thalassiosira. 1. Actinocyclus karstenii (Sample 178-1103A-13R-CC). 2. Actinocyclus actinochilus (Sample 178-1103A-14R-CC). 3. Thalassiosira sp. cf. Thalassiosira complicata (Sample 178-1103A-14R-CC). 4. Thalassiosira spp. (Sample 178-1103A-14R-CC). 5. Actinocyclus spp. (Sample 178-1103A-15R-CC). 6. Thalassiosira sp. aff. Thalassiosira oestrupii (Sample 178-1103A-13R-CC). 7. Thalassiosira oliverana var. sparsa (Sample 178-1103A-18R-1, 4-5 cm). 8, 9. Thalassiosira inura. (8) Sample 178-1103A-13R-CC, (9) Sample 178-1103A-15R-CC.