. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. Shell, transverse-oval, more pointed posteriorly, base slightly curved; beaks full, elevated; sulcate, dark chestnut; inside bluish; cardinal teeth small, indistinct; lateral teeth on a line with the primaries, large, promi- nent. H. II, W. 17, T. 8, mill. Station, running streams. Pickering Creek, Chester County; common. S. striatinum, Lam. Cyclas striatinum. Lam., An. S. Vert., V., 1818. ;S. striatinum. — [Prime.] Fig, 198.. Shell, thin, inequilateral, rounded anteriorly, posteri- orly elongated
![. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. Shell, transverse-oval, more pointed posteriorly, base slightly curved; beaks full, elevated; sulcate, dark chestnut; inside bluish; cardinal teeth small, indistinct; lateral teeth on a line with the primaries, large, promi- nent. H. II, W. 17, T. 8, mill. Station, running streams. Pickering Creek, Chester County; common. S. striatinum, Lam. Cyclas striatinum. Lam., An. S. Vert., V., 1818. ;S. striatinum. — [Prime.] Fig, 198.. Shell, thin, inequilateral, rounded anteriorly, posteri- orly elongated Stock Photo](https://c8.alamy.com/comp/REC6X9/conchologia-cestrica-the-molluscous-animals-and-their-shells-of-chester-county-pa-mollusks-shell-transverse-oval-more-pointed-posteriorly-base-slightly-curved-beaks-full-elevated-sulcate-dark-chestnut-inside-bluish-cardinal-teeth-small-indistinct-lateral-teeth-on-a-line-with-the-primaries-large-promi-nent-h-ii-w-17-t-8-mill-station-running-streams-pickering-creek-chester-county-common-s-striatinum-lam-cyclas-striatinum-lam-an-s-vert-v-1818-s-striatinum-prime-fig-198-shell-thin-inequilateral-rounded-anteriorly-posteri-orly-elongated-REC6X9.jpg)
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. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. Shell, transverse-oval, more pointed posteriorly, base slightly curved; beaks full, elevated; sulcate, dark chestnut; inside bluish; cardinal teeth small, indistinct; lateral teeth on a line with the primaries, large, promi- nent. H. II, W. 17, T. 8, mill. Station, running streams. Pickering Creek, Chester County; common. S. striatinum, Lam. Cyclas striatinum. Lam., An. S. Vert., V., 1818. ;S. striatinum. — [Prime.] Fig, 198.. Shell, thin, inequilateral, rounded anteriorly, posteri- orly elongated; sulcations slight, or irregular; color light or darker shades of green ; interior blue; hinge margin curved; cardinal teeth very small, lateral larger, not prominent, H, 8, W. ii, T. 6, mill.. 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 work.. Hartman, William Dell, 1817-1899; Michener, Ezra, 1794-1887. Philadelphia, Claxton, Remsen & Haffelfinger