. Bulletin - United States National Museum. Science. EASTERN PROVINCE SOUTHERN REGION SPECIES. 389 MESODOIV. (St>e p. 294.) Mesodota Rocsncci, rriciFi-'Eii. Shell with a narrow or i)artially covered umbilicus, sometimes im- perforate, depressed, rather thin, closely- striated, rather . ^^^ ^23. transparent and smooth, horn-colored; spire slightly elevated; suture lightly impressed; whorls 5, rather convex, increasing slowly, the last one subcarinate at its periphery, scarcely descending; aperture lunar, ob- lique, generally slightly contracted by a parietal denti- cle which obliquely enters
. Bulletin - United States National Museum. Science. EASTERN PROVINCE SOUTHERN REGION SPECIES. 389 MESODOIV. (St>e p. 294.) Mesodota Rocsncci, rriciFi-'Eii. Shell with a narrow or i)artially covered umbilicus, sometimes im- perforate, depressed, rather thin, closely- striated, rather . ^^^ ^23. transparent and smooth, horn-colored; spire slightly elevated; suture lightly impressed; whorls 5, rather convex, increasing slowly, the last one subcarinate at its periphery, scarcely descending; aperture lunar, ob- lique, generally slightly contracted by a parietal denti- cle which obliquely enters the mouth of the shell; per- istome white, thickened, the ujjper portion hardly ex- panded, reflected below, and at the columellar junction spreading into a thin, partial covering to the umbilicus. Greater diameter 21, lesser 18"""; height, 10"°^. HcUx Hoenieri, PfkifferJii Roemer's Texas, 455 (1849); Zeitschr. f. Mai., 1848,117.— Reeve, Cou. Icon., No. 6S0.—W. G. Binxey, Terr. Moll., iv, 55 ; L. & Sli., i, 146, lig. 250 (1869). Hdix deniifira, part, Pfeiffer, Mod. Hel. Viv., iii, 269; io Chemnitz, ed. 2, 331, pi. cxxxi, fi^s. 1-3, not of Binney. Mesodon Ixoeineri, Thyon, Am. Jouru. Conch., iii, 43 (1867).—W. G. Binney, Terr. V, 3:29. Near New Braunfels, Tex.; Washington County, Williamson County, Bosque County, and Colorado Eiver, Texas. A species of the Texas Subregion. This species was formerly confounded b^' Pfeiffer with denfifera, an. authentic specimen of which he had not seen. It is quite a distinct species, and inhabits a distinct geographical region. It may be distin- guished from dentifera most readily by attention to the following jnir- ticulars: Its umbilicus is generally but partially covered, while dentifera is always imperforate; its color is lighter, its surface smoother, and, above all, its peristome is not so broadly reflected; it is also distinctly subcarinate at the periphery. Jaw as usual; 7 ribs on one, 9 on a
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