. The Conchologists' exchange. Mollusks. 122 THE NAUTILUS. convinced that Lea's hicarwata is not the bicarinate form of Say's tricnrinata, but is a distinct species, which also has a tricarinate form. I have the typical form of V. hicarinata from Columbia and Philadelphia, Pa., and Port Oram, N. J., and the tricarinate form from Muscatine, la., and Utica, 111. Within the last few weeks I have had occasion to examine critically hundreds of specimens of F-. tricarinata in its various aspects from Michigan, and a considerable number from at least ten different states and Canada, and I have yet to
. The Conchologists' exchange. Mollusks. 122 THE NAUTILUS. convinced that Lea's hicarwata is not the bicarinate form of Say's tricnrinata, but is a distinct species, which also has a tricarinate form. I have the typical form of V. hicarinata from Columbia and Philadelphia, Pa., and Port Oram, N. J., and the tricarinate form from Muscatine, la., and Utica, 111. Within the last few weeks I have had occasion to examine critically hundreds of specimens of F-. tricarinata in its various aspects from Michigan, and a considerable number from at least ten different states and Canada, and I have yet to see the first specimen that in any way seems to connect the two. In comparison with V- tricarinata, Lea's species is larger, dis- coidal; the upper surface of the whorls slopes downwards from the carina to the suture, giving a concave appearance to the upper surface. 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
