Plate P17. Transmitted light microphotographs of radiolarians from Holes 1218A, 1219A, and 1220A. Scale bar = 100 µm for all figures except for fig. 9 (= 200 µm). 1, 2. Collosphaera sp. A; (1) Sample 199-1218A-24X-5, 71–73 cm (H21/3), (2) Sample 199-1220A-8H-7, 50–52 cm (N18/1). 3, 4. Collosphaera sp. B; (3) Sample 199-1220A-9H-1, 25–27 cm (Y39/1), (4) Sample 199-1220A-9H-3, 25–27 cm (Q24/0). 5. Zealithapium mitra (Sample 199-1218A-22X-3, 120–122 cm), N51/1. 6. Zealithapium anoectum (Sample 199-1218A-25X-3, 31–33 cm), C16/4. 7–9. Lithelius hexaxyphophorus; (7) Sample 199-1218A-25X-5, 120–122 cm (C27/0), (8) Sample 199-1220A-8H-3, 80–82 cm (U35/0), (9) Sample 199-1220A-9H-2, 25–27 cm (C33/4). 10. Rhopalodictyum californicum (Sample 199-1220A-9H-7, 25–27 cm), K25/1.