. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRICA. 73 P. armigera, Say. Planorbis armigerus, Say, Jour. Acad. Phila. F. S., II., 1821. Shell, light brown, polished; whorls 4, -P- armigera. sub-cylindrical, and sub-carinate below ; um- p/ â [^^' bilicus wide, and deep ; aperture rounded, (â^ with six white teeth, far within the throat; the largest thin, oblique, running back from Aperture of the left to the right side; on the left of this ' yIsHH^'^ is a small one, and around the vault four others; the teeth sometimes wanting.
. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRICA. 73 P. armigera, Say. Planorbis armigerus, Say, Jour. Acad. Phila. F. S., II., 1821. Shell, light brown, polished; whorls 4, -P- armigera. sub-cylindrical, and sub-carinate below ; um- p/ â [^^' bilicus wide, and deep ; aperture rounded, (â^ with six white teeth, far within the throat; the largest thin, oblique, running back from Aperture of the left to the right side; on the left of this ' yIsHH^'^ is a small one, and around the vault four others; the teeth sometimes wanting. H. 2%, W. 6%, mill. Station, Schuylkill River, and tributaries, Chester County. Genus ANCYLUS, Geoffroy, 1767. Shell, thin, patelliform, non-spiral; apex di- Animuiof ' ' ir i ' J. A:»cijlus. rected to the right; aperture wide ; peritreme [w. g. continuous, simple, entire. â¢^'^' â ^*^' Animal, tentacles triangular; mantle in- cluded; pulmonary orifice protected by a branchial appendage ; foot large. A. rivularis, Say, Jour. Acad. Phila. F. S., II., 1817. Shell, delicate, depressed-conic; apex ob- 11- . "1 [W. G. tuse nearer to, and leanmg towards, one p. ^^,0, side, and one end; aperture oval, narrower /p^ at one end, entire; within milk white. H. I^''^^~^ l>^, W. 3, mill. Station, on dead shells, and stones, in streams. Ches- ter County; frequent. 7. 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
