. Bulletin - United States National Museum. Science. 370 A MANUAL OF AMERICAN LAND SHELLS. Polyg^yra triodoiitoides, Bland. Shell umbilicated, globose-depressed, thin, subpellucid, pale horn- colored, with partially obsolete rib-like strife above; base convex, smooth; si)ire short; whorls 5, somewhat convex, the last Flo. 404. 7X7' ' plicately ribbed near the aperture, detiexed anteriorly; aper- ture roundly lunate, oblique, contracted; peristome reflected, callous, the margins joined by a sharp, linguiform, triangular, tooth, the right with a tooth on the margin of the callus, basal with an o
. Bulletin - United States National Museum. Science. 370 A MANUAL OF AMERICAN LAND SHELLS. Polyg^yra triodoiitoides, Bland. Shell umbilicated, globose-depressed, thin, subpellucid, pale horn- colored, with partially obsolete rib-like strife above; base convex, smooth; si)ire short; whorls 5, somewhat convex, the last Flo. 404. 7X7' ' plicately ribbed near the aperture, detiexed anteriorly; aper- ture roundly lunate, oblique, contracted; peristome reflected, callous, the margins joined by a sharp, linguiform, triangular, tooth, the right with a tooth on the margin of the callus, basal with an oblique tooth, both teeth small and far apart. Greater diameter 9J, lesser 8"'"; height, 5"""^. Melix Modonfoides, Bland, Ann. N. Y. Lye, vii, 424, pi. iv, figs. 11, 12 (1861).—W. G. BiNNKY, L. &. Sh., i, 94 (1869). Helix Texasiaita, "NV. G. Binney, Terr. Moll., iv, 79, pi. Ixxviii, fig. 18. Dn>dalocMla iriodontoides, Try'ON, Am. Journ. Conch., iii, 62 (1867). Polygyra triodonloides, W. G. Binney^, Terr. Moll., v, 271. Corpus Christi and De Witt County, Texas, belonging, therefore, to the Texan Subregion; but I have traced it northward into the Indian Territory (Choctaw Nation). P. triodontoides is a more delicate shell than F. Texasiana, and does not usually attain the same size. It is not as distinctly' ribbed, is somewhat more elevated, and the aperture more round. The last whorl is less devious at its termination beneath, the peristome teeth are smaller and wide apart. In P. Texasiana they are close together, and the space between them has much resemblance to the notch in Stenotrema hirsufum. In that respect, as well as in the form of the aperture, Moricand's shell is more closely allied to P. Mooreana^ W. G. Binney. Lingual membrane as in fastigans, cereolus, &c. I*oIysy*'a Mooreaiia, W. G. Binney. Shell umbilicated, orbicular, globose, white, subcarinated; spire more 405 ^^' ^^^^ depressed, obtusely rounded; whorls C, disti
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