. Bulletin - United States National Museum. Science. EASTERN PROVINCE IMTEKIOK EEGION SPECIES. 317 Fig. 340. jwincanus. Mcsodoii Dowiiicaiius, Bland. Shell umbilicate, imibilicus nearly covered, snbgiobose, thin, Subpel- lucid, with obsolete, rib-like striai decussated with crowded, microscopic spiral lines-, greenish horn-colored; s])ire short, obtuse; whorls 5, convex, the last tumid, anteriorly some- what gibbous, scarcely descending, constricted; aperture, oblique, lunate-oval; peristome white, labiate, reflected, right margin exi)anded, columellar margin angularly di-m. doi lated, nearly
. Bulletin - United States National Museum. Science. EASTERN PROVINCE IMTEKIOK EEGION SPECIES. 317 Fig. 340. jwincanus. Mcsodoii Dowiiicaiius, Bland. Shell umbilicate, imibilicus nearly covered, snbgiobose, thin, Subpel- lucid, with obsolete, rib-like striai decussated with crowded, microscopic spiral lines-, greenish horn-colored; s])ire short, obtuse; whorls 5, convex, the last tumid, anteriorly some- what gibbous, scarcely descending, constricted; aperture, oblique, lunate-oval; peristome white, labiate, reflected, right margin exi)anded, columellar margin angularly di-m. doi lated, nearly covering the umbilicus. Greater diameter 10.^, lesser 9^'""'; height, G'"'". HeUx Doivnkava, Bland, Ann. N. Y. Lye, vii, 420, pi. iv, figs. 23, 24 (1861).—W. G. BiNNEY, L. & Sh., i, 151 (IfiO'J). MesodoH Dotvnkana, Tryox, Am. Journ. Conch., iii, 47 (1867).—W. G. BixnfA", Terr. Moll., V, 33.'>. Monroe County; University Place, Franklin County, Tennessee; Whitley County, Kentucky. A species of the Cumberland Subregion, Animal with the usual characters of the genus. Jaw as usual; over 10 ribs. The lingual membrane (Terr. Moll., V, Plate VIII, Fig. F) has 35-1- 35 teeth, with 12 laterals. The side cusps and cutting points are visi- ble on the second lateral tooth. Mesodoii \%'i, Lewis. Shell narrowly umbilicated, globose, surface hardly broken by deli- cate incremental striae, horn-colored; sjiire elevated, apex obtuse; whorls 4, convex, suture impressed, the last globose, descending, deeply constricted behind the j)eristome; aper- ture oblique, lunate, narrow, with a liuguiform tooth on the parietal wall; peristome white, thickened, reflected, its ter- minations approached slightly, that of the columellar some- what concealing the very narrow umbilicus. Greater diam- eter 6, lesser 5"^™; height, 3™". Helix Laid, Lewis, Proc. Acad. Kat. Sci. Pliila., 1874, 118 (fig). Mesodon Lawi, \V. G. Bixney, Terr. Moll., v, 335. Proba
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