Plate P30. Diatoms from rise Site 1103. 1. Gen. et sp. indet. (Sample 178-1103A-31R-1, 39-40 cm). 2. Coscinodiscus marginatus (Sample 178-1103A-38R-CC). 3, 4, 9. Thalassiosira aff. trifulta group (Sample 178-1103A-38R-CC). 5, 10. Porosira sp. (Sample 178-1103A-31R-1, 39-40 cm). 6-8. Sample 178-1103A-31R-1, 39-40 cm). (6) Gen. et sp. indet., (7) Thalassiosira? spp., (8). Thalassiosira spp. 11, 12. Thalassiosira spp. (11) Sample 178-1103A-31R-1, 39-40 cm, (12) Sample 178-1103A-38R-CC.