Plate P4. 1. Actinocyclus cubitus Hanna and Grant (Sample 185-1149A-10H-4, 135-141 cm). 2. Actinocyclus curvatulus Janisch (Sample 185-1149A-3H-2, 133-139 cm). 3. Actinocyclus ellipticus Grunow (Sample 185-1149A-1H-4, 142-148 cm). 4. Actinocyclus ellipticus var. elongatus (Grunow) Kolbe (Sample 185-1149A-1H-1, 61-63 cm). 5. Actinocyclus ingens Ratray (Sample 185-11490A-11H-3, 131-137 cm). 6. Actinocyclus octonarius Ralfs (Sample 185-1149A-2H-4, 43-45 cm). 7. A. oculatus Jouse (Sample 185-1149A-6H-1, 112-114 cm). Scale bars = 10 µm.