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Heterobrissus montesi Manzoni & Mazzetti, 1877; Middle Miocene, S. Leo, Emilia, Italy. Oral view. From Stefanini, G. 1908. Echinidi del Miocene Medio dell'Emilia. Palaeontographia italica 14, 65-119, pls 13-16 (pl. 14, fig.5).

Length of test 105 mm.