Plate P1. Chiastozygaceae. 1–12. Ahmuellerella alboradiata; (1) holotype (Sample 198-1209C-16H-6, 50 cm), (2–12) Sample 198-1209C-16H-6, 50 cm. 13–19. Ahmuellerella regularis (Sample 198-1210A-24H-4, 55 cm). 20–24. Bukrylithus cf. B. ambiguus; (20, 21) Sample 198-1210B-25H-7, 60 cm, (22–24) Sample 198-1210B-27H-CC. 25, 26. Chiastozygus litterarius; (25) Sample 198-1210B-31H-CC, (26) Sample 198-1210B-34H-CC. 27–30. Chiastozygus cf. C. trabalis (Sample 198-1210B-38H-CC). 31–35. Helicolithus anceps; (31–33) Sample 198-1210B-36H-7, 60 cm, (34, 35) Sample 198-1210B-27H-CC. 36. Chiastozygus sp. (Sample 198-1210B-35H-2, 120 cm). 37. Loxolithus amilla (Sample 198-1208A-40X-3, 70 cm). 38–42. Loxolithus thiersteinii; (38) Sample 198-1210B-25H-CC, (39) Sample 198-1208A-41H-1, 10 cm, (40

Plate P1. Chiastozygaceae. 1–12. Ahmuellerella alboradiata; (1) holotype (Sample 198-1209C-16H-6, 50 cm), (2–12) Sample 198-1209C-16H-6, 50 cm. 13–19. Ahmuellerella regularis (Sample 198-1210A-24H-4, 55 cm). 20–24. Bukrylithus cf. B. ambiguus; (20, 21) Sample 198-1210B-25H-7, 60 cm, (22–24) Sample 198-1210B-27H-CC. 25, 26. Chiastozygus litterarius; (25) Sample 198-1210B-31H-CC, (26) Sample 198-1210B-34H-CC. 27–30. Chiastozygus cf. C. trabalis (Sample 198-1210B-38H-CC). 31–35. Helicolithus anceps; (31–33) Sample 198-1210B-36H-7, 60 cm, (34, 35) Sample 198-1210B-27H-CC. 36. Chiastozygus sp. (Sample 198-1210B-35H-2, 120 cm). 37. Loxolithus amilla (Sample 198-1208A-40X-3, 70 cm). 38–42. Loxolithus thiersteinii; (38) Sample 198-1210B-25H-CC, (39) Sample 198-1208A-41H-1, 10 cm, (40–42) Sample 198-1210B-37H-CC.