. A conchological manual. Shells. rig. 40, numerous; il,few, continuous; 4,2, few, discontinuous. Aperture. The aperture or opening of the spiral tube, was for- merly called the " mouth ;" a term calculated to convey an. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sowerby, G. B. (George Brettingham), 1812-1884. London H. G. Bohn

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Keywords: ., bookauthorsow, bookcentury1800, bookdecade1850, booksubjectshells