. Bulletin - United States National Museum. Science. SOG A MANUAL OF AMERICAN LAND SHELLS. 1n<]r, iSubequally reflected, that of the columella narrow, adherent, or subdilated and spreading. Greater diameter ]6i, lesser 14i'""; height, 10""". Helix MUcheUiana, Lea, Am. Phil. Trana., vi, 87, pi. xxiii, lig. 71 ; Obs., ii, 87 (1839); Troschel, Arch. f. Nat., 1839, ii, 221.âDe Kay, N. Y. Moll., 45 (1843).â Pfeiffer, Mon. Hel. Viv., i, 291; iv, 322.âBlaxd, Ann. N. Y. Lye, vi, 339 (1858).âW. G. BiNXEY, Terr. Moll., iv, 47; L. A: Sh., i, 141 (1869). Helix clausa, Bi
. Bulletin - United States National Museum. Science. SOG A MANUAL OF AMERICAN LAND SHELLS. 1n<]r, iSubequally reflected, that of the columella narrow, adherent, or subdilated and spreading. Greater diameter ]6i, lesser 14i'""; height, 10""". Helix MUcheUiana, Lea, Am. Phil. Trana., vi, 87, pi. xxiii, lig. 71 ; Obs., ii, 87 (1839); Troschel, Arch. f. Nat., 1839, ii, 221.âDe Kay, N. Y. Moll., 45 (1843).â Pfeiffer, Mon. Hel. Viv., i, 291; iv, 322.âBlaxd, Ann. N. Y. Lye, vi, 339 (1858).âW. G. BiNXEY, Terr. Moll., iv, 47; L. A: Sh., i, 141 (1869). Helix clausa, BiNNEY, Terr. Moll., ii, ll9; in iii, pi. iv, outliue figures. Mesoclon llitcIuJUaua, Try'OX, Am. Jonru. Conch., iii, 45 (1867).âW. G. Binney', Terr. Moll., v, 323. Kentucky and Ohio, along the Ohio Eiver; Monroe County, Vir- ginia; Cherokee County, North Carolina. A species of the Interior IJegion. Ill M. claust(s the umbilical region is more widely excavated, and the groove behind the reflected peristome producing the contraction of the aperture is coutiuued at the base of the shell, becoming wider as it joins the umbilical opening. In M. MitchcUianns the groove is almost obliterated at the point of reflection of the peristome over the umbilicus by the more tumid character of the last whorl. Jaw arcuate, of uniform width throughout; ends blunt; anterior Fig â ill surface with 12 crowded, coarse ribs, denticulating either margin. Lingual membrane (Terr. Moll., V, Plate VIII, Fig. Jnwot H) with 40-1-49 teeth; 18 laterals. Outer laterals have 2i. Mitclicllianus. ... , . Side cusps aim cutting points. The genital system is long and narrow. The oviduct is greatly con- voluted. The penis sac is long, stout, cylindrical, with a bulb-like expansion at its apex, at which point both vas deferens and retractor muscle are inserted. The genital bladder is lengthened, ovate, not much larger than its duct, which is short, and enters the vagina below the middle of its length (Terr. Moll.
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