Oral coelom of Antedon rosacea, [585]

Oral plates, of Crinoidea, [588];

of Thaumatocrinus, [589];

of Hyocrinus, [588], [590];

of Holopus, [588], [592];

of Rhizocrinus, [589], [591];

absent in adult Antedon, [589];

of Rhizocrinidae, [590], [591];

of Bathycrinus, [591];

of Cystoidea, [598];