Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 Conus marmoreux, Gme- liu. China. FIG. 565. Mitraepiscopalis, D'Org. Reduced. Ceylon. Other prosobranchiates have the margin of the aperture entire, and the operculum horny or shelly, and usually spiral. These are called Holostoma, and are mostly plant-

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