Plate P1. Diatoms from rise site: Denticulopsis and Crucidenticula. 1-6. Denticulopsis simonsenii (Sample 178-1095B-45X-1, 41-42 cm). (1, 2a, 2b, 3a, 3b) valve view, (4) girdle view, (5) open copula, (6a, 6b) initial cell. 7, 8. Denticulopsis vulgaris. (7a, 7b) Sample 178-1095B-30X-6, 25-26 cm, (8a, 8b) Sample 178-1095B-43X-2, 64-65 cm. 9, 13, 14. Denticulopsis hustedtii. (9a, 9b) Sample 178-1095B-43X-2, 64-65 cm, (13a, 13b, 14a, 14b) Sample 178-1095B-45X-1, 41-42 cm. 10. Denticulopsis praehyalina (Sample 178-1095B-10H-2, 60-61 cm). 11, 12. Crucidenticula sp. cf. Crucidenticula var. pacifica. (11) Sample 178-1095B-12H-5, 30-31 cm, (12a, 12b) Sample 178-1095-36X-2, 52-54 cm. 15-18. Denticulopsis crassa. (15a, 15b) valve view (Sample 178-1095B-43X-2, 64-65 cm), (16-18) closed copula (Sample 178-1095B-45X-1, 41-42 cm). 19. Denticulopsis dimorpha var. areolata, closed copula (Sample 178-1095B-9H-4, 105-106 cm). 20. Denticulopsis ovata, closed copula (Sample 178-1095B-21X-4, 128-130 cm).