The Echinoid Directory

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Paraphormosoma alternans (de Meijere, 1902). Drawings of apical disc (one ocular and two genital plates), and adoral (lower left) and adapical (lower right) ambulacral plating. From Mortensen, T. 1935. A monograph of the Echinoidea. Volume 2, Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C.A. Reitzel, Copenhagen (Figs 94, 95).