The Echinoid Directory

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Nucleopygus [Clitopygus] lorioli (Cotteau, 1871); phyllode and apical disc. Phyllode drawing from P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections, 144 (3) 262 pp (text-fig. 40). Apical disc drawing from G. Cotteau. 1867-1874. Paleontologie francaise ou description de fossiles de la France terrain Jurassiques. Tome IX. Echinoidea. G. Masson, Paris. 552 pp., pls. 1-142, (plate 64, fig. 6).