The Echinoid Directory

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Tromikosoma hispidum (Agassiz, 1898). Recent. Apical surface, from Agassiz, A. 1904. Reports on an exploration off the West coasts of Mexico, Central and South Amercia, and off the Galapagos Islands. The Panamic deep sea echinoids. Memoirs of the Museum of Comparative Zoology 32, 243 pp., 112 pls (pl. 31, fig. 2).

Diameter of test 75 mm.