Plate P1. Illustrations of taxa, sample, and slide number. Scale bar = ~20 µm unless stated otherwise. Scanning electron microscope (SEM) photographs have varying scale bars. 1. Adnatosphaeridium multispinosum (Sample 189-1172D-15R-3, 40-42cm) (1). 2. Aio

Plate P1 (continued). 145. Alisocysta circumtabulata (Sample 189-1172D-23R-1, 41-43 cm) (SEM). 146. Alisocysta reticulata (Sample 189-1172D-23R-1, 41-43 cm) (SEM). 147. Alterbidinium sp. (Sample 189-1172D-24R-5, 40-42 cm) (SEM). 148, 149. Cerebrocysta spp. (148) Sample 189-1172D-3R-4, 40-42 cm (SEM); (149) Sample 189-1172A-39X-4, 40-42 cm (SEM). 150. Cerodinium dartmoorium (Sample 189-1172D-23R-1, 41-43 cm. 151-153. Cerodinium sp. A (Sample 189-1172D-29R-5, 40-42 cm) (SEM) (153: detail). 154. Cleistosphaeridium spp. (Sample 189-1172D-12R-7, 40-42 cm) (SEM) 155. Corrudinium incompositum (Sample 189-1172A-39X-3, 138-140 cm) (SEM). 156. Corrudinium sp. Goodman and Ford, 1983 (Sample 189-1172A-39X-3, 138-140 cm) (SEM).