The Echinoid Directory

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Sperosoma grimaldii Koehler, 1897. Oral surface; from Mortensen, T. 1935. A monograph of the Echinoidea. Volume 2, Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C.A. Reitzel, Copenhagen (plate 8).

Diameter of test 120 mm.