A, B Heterocyathus alternatus (ORI_DIIIe1_1, locality data unknown) A calicular view B lateral view C, D Heterocyathus monileseptatum sp. nov. (SAM_H1431, off Durban Harbour, 99 m) C calicular view D lateral view E, F Heterocyathus sulcatus (SAMC_A073123, off Shaka’s Rock, 100–105 m) E calicular view F lateral view G, H Labyrinthocyathus delicatus (SAM_H2836, off East London, 146–238 m) G calicular view H lateral view I, J, K Monohedotrochus capensis comb. nov. I, J (SAMC_A088924, off Kidds Beach, 247–147 m) I calicular view J lateral view K (SAM_H3210, off Scottburgh, 690 m) calicular view L, M Polycyathus sp. (USNM 91677, off Port Dunford, 69 m) L calicular view M full view N, O Rhizosmilia robusta (USNM 91689, off Kosi Bay Estuary, 74 m) N calicular view O lateral view P Solenosmilia variabilis (SAM_H3158, off Cintsa, 630 m) full view. Scale bars: 10 mm (A–G, I–O); 100 mm (H, P).