. Annual report of the Board of Regents of the Smithsonian Institution . Fig. .i. —Ielccyiiliora pectinata(enlarged (5 diameters). Fig. ti.—Iilicvpliora aselliiormis(slightly reduced). Types of Mamillaria and Pelecyphora. Smithsonian Report, 1908.—Safford. Plate 15. W^ ^ in ^ ^EsB 1 ^^1 1 mni H Fig. ].—Arioparpiis retusus.

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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840