Plate P1. Specimens of Distephanus speculum speculum forma cylindrus n.f. from Holes 747A and 1140A (scale bar = 10 mm). 1a, b. Holotype (Sample 183-1140A-1R-5, 26-27 cm); (a) apical ring in focus, (b) basal ring in focus. 2. Tilted specimen showing strut connection apical and basal rings (Sample 120-747A-7H-6, 98-100 cm). 3a, b. Sample 183-1140A-1R-5, 26-27 cm; (a) apical ring in focus, (b) basal ring in focus. 4. Tilted specimen showing strut connection apical and basal rings (Sample 183-1140A-1R-4, 23-24 cm). 5a, b. Sample 183-1140A-1R-4, 23-24 cm; (a) apical/basal in focus, (b) basal/apical in focus. 6a, b. Sample 183-1140A-1R-4, 23-24 cm; (a) apical ring in focus, (b) basal ring in focus. 7a, b. Sample 183-1140A-1R-5, 26-27 cm; (a) apical ring in focus, (b) basal ring in focus.

Plate P1. Specimens of Distephanus speculum speculum forma cylindrus n.f. from Holes 747A and 1140A (scale bar = 10 mm). 1a, b. Holotype (Sample 183-1140A-1R-5, 26-27 cm); (a) apical ring in focus, (b) basal ring in focus. 2. Tilted specimen showing strut connection apical and basal rings (Sample 120-747A-7H-6, 98-100 cm). 3a, b. Sample 183-1140A-1R-5, 26-27 cm; (a) apical ring in focus, (b) basal ring in focus. 4. Tilted specimen showing strut connection apical and basal rings (Sample 183-1140A-1R-4, 23-24 cm). 5a, b. Sample 183-1140A-1R-4, 23-24 cm; (a) apical/basal in focus, (b) basal/apical in focus. 6a, b. Sample 183-1140A-1R-4, 23-24 cm; (a) apical ring in focus, (b) basal ring in focus. 7a, b. Sample 183-1140A-1R-5, 26-27 cm; (a) apical ring in focus, (b) basal ring in focus.