. Bulletin - United States National Museum. Science. 304 A MANUAL OF AMERICAN LAND bHEILS. suuiller, short, swollen at its entrance iuto the vagina; oviduct greatly couvoluted. Mcsofloii Peiiiisylvaiiiciis, Gueen. Shell imperforate, convex, elevated; epidermis yellowish horn-color or russet; whorls 6, convex, with crowded, elevated, oblique FUi. 324. 7 7 7 7 7 1 strice ; suture distinctly miirked ; aperture subtriangular, contracted by the peristome; peristome white, narrow, reflected, not flattened, with sometimes a slight thicken- '^ -_ iug on the inner side near the base; umbilical region i
. Bulletin - United States National Museum. Science. 304 A MANUAL OF AMERICAN LAND bHEILS. suuiller, short, swollen at its entrance iuto the vagina; oviduct greatly couvoluted. Mcsofloii Peiiiisylvaiiiciis, Gueen. Shell imperforate, convex, elevated; epidermis yellowish horn-color or russet; whorls 6, convex, with crowded, elevated, oblique FUi. 324. 7 7 7 7 7 1 strice ; suture distinctly miirked ; aperture subtriangular, contracted by the peristome; peristome white, narrow, reflected, not flattened, with sometimes a slight thicken- '^ -_ iug on the inner side near the base; umbilical region in- dentcd. Greater diameter 17, lesser 15"""; height, 11""". Hcl'tx rennsylvanwa, Greex, Contributions to M.', Nos. 1, 8.—Binney, Bost, Jonrn. Nat. Hist., i, 483, pi. xvi (1837); Terr. Moll., ii, 105, pi. vii.—Pfeikfer, Symbohe, ii, 36; Mon. llel. Viv., i, 291 (oxcl. II. dausa) ; iv, 321; in Chem- nitz, ed. 2, ii, 51, t. Ixxiii, figs. 4, 5 (excl. B. claiisa).—I)v:. Kay, N. Y. ]\Io11., 41, pi. iii, fig. 35 (1843).—Mrs. Gray, fig. Moll. Au., pi. ccxci, lig. 5, from Bost. Jonrn, no descr.—Keeve, Con. Icon., No. 676 (excl. syn.).—Blaxd, Ann. N. Y. Lye, vi, 299 (1858).—W. G. Binney, , iv, 15; L. & W. Sh., i, 140 (1869). Helix Mitchclliatra, Desiiayes, in Vi:R., i, 137, , figs. 4-7, not 13-16. Mesodon Pcnnsijlvnnica, Tryon, Am. Jonrn. Conch., iii, 44 (1867).—W. G. Binney, Terr. Moll., v, 321. Western part of Pennsylvania; Ohio; Illinois; Kentucky; Monroe County, Virginia. It thus appears a species of the Interior Eegion. Animal: Upper surface of a dull, uniform leadcolor, lower surface of the foot lighter; about twice as long as the transverse diameter of the shell (see B. J. K H., I, Plate V). This species may be readily distinguished from clausus and MitcheUi- anus by its somewhat triangular aperture, which is more like that of elevatus; it is more elevated, has usually G whorls, more
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