The Echinoid Directory

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Hapalosoma pellucidum (Agassiz, 1879). Adoral and adapical ambulacral plating. From Mortensen, T. 1935. A monograph of the Echinoidea. Volume 2, Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C.A. Reitzel, Copenhagen (fig. 149).