. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRiCA. 9I rounded, extremity; hinge margin elevated; base slightly curved; posteriorly sloped above, and below, to an acute angle ; dark brown, or greenish ; nacre hyaline-purple ; cardinal teeth small, compressed, oblique. H. .85, W. , L. 4, inches. Station, White Clay Creek, Chester County. U. heterodon, Lea, Trans. Amer. Phil. Soct., III., 1829. U. heterodon. Fig. Shell, small, thin, greenish-brown, obscurely rayed; rhomboid-ovate, ventricose; rounded before; base nearl
. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRiCA. 9I rounded, extremity; hinge margin elevated; base slightly curved; posteriorly sloped above, and below, to an acute angle ; dark brown, or greenish ; nacre hyaline-purple ; cardinal teeth small, compressed, oblique. H. .85, W. , L. 4, inches. Station, White Clay Creek, Chester County. U. heterodon, Lea, Trans. Amer. Phil. Soct., III., 1829. U. heterodon. Fig. Shell, small, thin, greenish-brown, obscurely rayed; rhomboid-ovate, ventricose; rounded before; base nearly straight; dorsal margin elevated, behind the hinge; posterior margin oblique; beaks undulated, prominent; nacre bluish-white; cardinal teeth compressed, oblique; lateral tooth double in the right valve. H. .5, W. .8, T. .4, inch. Station, Schuylkill River, Chester County; abundant. Sub-genus MARGARITANA, Schumacher, 1817. Shell, thick, strong; cardinal teeth stout, triangular; lateral tooth absent. Animal, gills free from the abdominal sac, and not united to the mantle, posteriorly; inferior siphon fringed, superior plane. M. margaritifera, Linn. Mya margaritifera, Linnaeus, Syst. Nat., 1758. Alasmodonta, Barnes, 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
