The Echinoid Directory
Araeosoma fenestratum (Wyville Thomson, 1872). Detail of apical disc, oral and adapical ambulacral plating. From Mortensen, T. 1935. A monograph of the Echinoidea. Volume 2, Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C.A. Reitzel, Copenhagen (figs 130, 131).