Plate P31. Diatoms from rise sites: Stephanopyxis and others. 1-4. Sample 178-1097A-18R-1, 4-5 cm. (1) Stephanopyxis sp., (2a, 2b) Stephanopyxis turris, (3) Stephanogonia sp. (girdle view),(4) Stellarima spp. 5, 6.Sample 178-1097A-35R-CC. (5) Coscinodiscus marginatus, (6) Melosira omma.