. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. aperture, is 27°; while in V. pulchella it is 35°. They also differ in the dentition of the lingual membrane; and the periostraca. Both species agree in presenting varieties which are strongly, and transversely, costate. Sub-genus PATULA, Heldwig, 1837. Shell umbilicate, turbinate, or depressed-discoid; ru- gose or costate-striate; whorls 4-5, sub-equal; aperture lunate-rotundate ; peristome simple, acute, straight. P. striatella, Anthony. Helix striatella, Anthony, Bost. Jour. Nat. Hist, III., 18
. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. aperture, is 27°; while in V. pulchella it is 35°. They also differ in the dentition of the lingual membrane; and the periostraca. Both species agree in presenting varieties which are strongly, and transversely, costate. Sub-genus PATULA, Heldwig, 1837. Shell umbilicate, turbinate, or depressed-discoid; ru- gose or costate-striate; whorls 4-5, sub-equal; aperture lunate-rotundate ; peristome simple, acute, straight. P. striatella, Anthony. Helix striatella, Anthony, Bost. Jour. Nat. Hist, III., 1840. r. strtatenn. — [B. &. B.] Fig, 71. tTaw of P. striatella. — [Morse.] Fig. 72. Shell depressed-convex, reddish horn color, or brown ;. 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
