Plate 13. 1, 7. Zygrhablithus bijugatus (Deflandre) Deflandre. (1) Top view, ×6000, Sample 149-900A-39R-3, 109 cm. (7) Sample 149-900A-53R-4, 11 cm, XP. 2, 3.TR Triquetrorhabdulus milowii Bukry, Sample 149-900A-29R-1, 122 cm. (2) Side view, ×6000. (3) XP. 4-6. Triquetrorhabdulus challengeri Perch-Nielsen. (4) Sample 149-898A-29R-3, 65 cm, XP. (5, 6) Sample 149-898A-25R-CC, 60 cm, XP (5) and Ph (6). 8-10. Zygrhablithus sp. 1, Sample 149-898A-26R-1, 102 cm. (8) XP, low focus. (9) XP, high focus. (10) Ph. 11, 12. Triquetrorhabdulus serratus (Bramlette and Wilcoxon) Olafsson, Sample 149-898A-22R-5, 86 cm, XP (11) and Ph (12). 13, 14. Triquetrorhabdulus rioi Olafsson, XP, Sample 149-898A-19R-1, 106 cm, and Ph. 15, 16, 22. Triquetrorhabdulus rugosus Bramlette and Wilcoxon. (15-16) Sample 149-900A-14R-5, 142 cm, XP (15) and Ph (16). (22) Sample 149-900A-15R-1, 87 cm, Ph. 17-21. Triquetrorhabdulus carinatus Martini. (17, 18) Sample 149-898A-27R-5, 26 cm, XP (17) and Ph (18). (19-21) Sample 149-900A-12R-4, 15 cm; XP, 0° (19), XP, 45° (20), and Ph 21). 23, 24. Amaurolithus primus (Bukry and Percival) Gartner and Bukry. (23) Sample 149-900A-12R-1, 112 cm, Ph. (24) Sample 149-900A-11R-CC, Ph. 25, 26. Amaurolithus delicatus Gartner and Bukry. (25) Sample 149-900A-12R-1, 112 cm, Ph. (26) Sample 149-900A-12R-1, 48 cm, Ph. 27, 28. Minylitha convallis Bukry, Sample 149-900A-14R-5, 142 cm, XP (27) and Ph (28).