Plate 9. 1, 4-7. Helicosphaera wilcoxonii Gartner. (1, 4, 5)^TR, Sample 149-900A-51R-6, 47 cm. (1) Distal view, ×4000. (4, 5) XP and Ph. (6, 7) Sample 149-900A-52R-6, 14 cm, XP (6) and PL (7). 2, 8-11. Helicosphaera compacta Bramlette and Wilcoxon. (2, 8, 9)^TR, Sample 149-900A-51R-6, 47 cm. (2) Proximal view, ×4000. (8, 9) XP and PL. (10, 11) Sample 149-900A-52R-6, 14 cm, XP (10) and PL (11). 3, 12-14. Helicosphaera euphratis Haq. (3) Proximal view, ×5000, Sample 900A-51R-6, 47 cm. (12, 13) (large flange) Sample 149-898A-24R-4, 121 cm, XP (12) and Ph (13). (14) Sample 149-897C-7R-2, 122 cm, XP. 15, 24-27. Helicosphaera elongata Theodoridis. (15)Sample 149-900A-44R-1, 131 cm, XP. (24, 25) Sample 149-900A-33R-5, 129 cm, XP (24) and Ph (25). (26, 27) Sample 149-900A-34R-2, 83 cm, XP (26) and Ph (27). 16. Helicosphaera bramlettei Muller, Sample 149-900A-51R-5, 120 cm, XP. 17. Helicosphaera reticulata Bramlette and Wilcoxon, Sample 149-900A-33R-4, 91 cm, XP. 18. Helicosphaera truempyi Biolzi and Perch-Nielsen, Sample 149-899B-7R-2, 122 cm, XP. 19. Helicosphaera gartneri Theodoridis, Sample 149-900A-27R-3, 33 cm, XP. 20-23. Helicosphaera intermedia Martini. (20, 21) Sample 149-898A-32R-3, 34 cm, XP (20) and PL (21). (22, 23) Sample 149-900A-32R-3, 7 cm, XP (22) and Ph (22).