. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. 42 CONCHOLOGIA CESTRICA, JH. electrina. [B. & B.] Fig. 60. Station, under logs and loose bark. Chester County; frequent. H. electrina, Gould. Helix electrina, Gould, Invert., Mass., 1841. Shell very thin, pale; whorls 3^, the last rapidly enlarging; spire depressed; aperture rounded ; peristome simple, acute ; lip not flexuous; umbilicus very narrow, and deep. H. 2, W. 4, mill. Station, in company with the preceding. Chester County; rare. H. arborea, Say. Helix arboreus, Say, Nich. Encyc, Amer
. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. 42 CONCHOLOGIA CESTRICA, JH. electrina. [B. & B.] Fig. 60. Station, under logs and loose bark. Chester County; frequent. H. electrina, Gould. Helix electrina, Gould, Invert., Mass., 1841. Shell very thin, pale; whorls 3^, the last rapidly enlarging; spire depressed; aperture rounded ; peristome simple, acute ; lip not flexuous; umbilicus very narrow, and deep. H. 2, W. 4, mill. Station, in company with the preceding. Chester County; rare. H. arborea, Say. Helix arboreus, Say, Nich. Encyc, Amer. Ed., 1817. Shell much depressed, thin, shining, amber- colored ; whorls 4^, increasing regularly; umbilicus moderate, deep; lip slightly flexu- ous; lines of growth indistinct. H. 23^, W, 5, mill. Station, under decayed wood, and rubbish. Chester County; abundant. H. hydrophila, Ingalls. Helix hydrophila, Ingalls, in collection unpublished. B. arborea. [B. & B.] Fig. 61. B, hi/flrophila. [B. & B.] Fig. 62. Shell depressed-conical, thin, amber- colored ; whorls 4 to 4}2 ; suture well impressed; umbilicus deep, crateriform; aperture lunate, sub-deflected; lip thin, sub-angular. H. 3, W. 6, mill. Station, under logs, and boards, near the water. Schu}'lkill tide marsh, Phila- delphia. Obs. — We prefer to keep this distinct from H. nitida, Miill., of 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
