. The Conchologists' exchange. Mollusks. '-6, 13, 13a, Pisidium cruciatum Sterki. 7-12, P. punctatum Sterki. 14, Olivella gracilis v. Gaylordi Ford. 15, Haminea virescens 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 Averell, William D. Philadelphia, Wm. D. Averell

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188