. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRICA. 35 A. alternata, Say. Helix alternata, Say, Nich. Encyc, Amcr. Ed., 1816. A. alternntn. — [B. & B] Fig. 36,. 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 Hartman, William Dell, 1817-1899; Michener, Ezra, 1794-1887. Philadelphia, Claxton, Remsen & Haffelfinger

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmollusks, bookyear187