. Bulletin - United States National Museum. Science. n68 A MANUAL OF AMKKICAN LAND SHELLS. ftunislied with two white, acute dentich's; on tbe right margin is phiced a white, subper])eudicular, extended lamina. Greater diameter 13, lesser 11"""; height, 7i""". Helix vcntrosula, Pfpuffer, Proc. Zool. Soc, 1845, 131; Mon. Hel. Viv., i, 417; in , ed. 2, i, 373 (1840), pi. Ixv, figs. 5, G (1849).—Reeve, Con. Icon., No. 687 (185':2).—W. G. Binney, Terr. Moll., iv, 73, pi. Ixsvii, fig. 14; L. & Sli., i, 92. fig. 1(54 (IH(;9).—Crosse nnd Fischer, Moll.
. Bulletin - United States National Museum. Science. n68 A MANUAL OF AMKKICAN LAND SHELLS. ftunislied with two white, acute dentich's; on tbe right margin is phiced a white, subper])eudicular, extended lamina. Greater diameter 13, lesser 11"""; height, 7i""". Helix vcntrosula, Pfpuffer, Proc. Zool. Soc, 1845, 131; Mon. Hel. Viv., i, 417; in , ed. 2, i, 373 (1840), pi. Ixv, figs. 5, G (1849).—Reeve, Con. Icon., No. 687 (185':2).—W. G. Binney, Terr. Moll., iv, 73, pi. Ixsvii, fig. 14; L. & Sli., i, 92. fig. 1(54 (IH(;9).—Crosse nnd Fischer, Moll. Mex. et Gnat., 274 (1870). Da'daloeliila reiilroiiula. T\:\'0N, Am. Jouni. Conch., iii, 63 (1867). Fohigiira ventrosiiht, W. (J. Binney, Terr. Moll., v, 369. A Mexicaii species, found also in the Texas Subregiou. Jaw strongly arcuate, of uniform width, ends blunt, anterior surface with 8 broad ribs, crenulating both margins (see Fig. 301, p. 360). Lingual membrane with 93 rows of 24-1-24 teeth each, 9 laterals; I'lG 401. centrals tricuspid, the side cusps very small; laterals of same shape, but bicuspid; marginals with one inner, Lingual dentition of p. ren«rosM«a. obliqUC, bluutly bifid Cut- ting point and one smaller outer cutting Polygyra Bliiidsi, Pfeiffer. Shell narrowly umbilicated, depressed, delicately striate, brownish ^'J^o^. horn-color, diaphanous, thin, shining; spire slightly elevated; whorls 5, flattened, the last deflected at the aperture, more convex and constricted below; umbilicus pervious; aperture very oblique, lunate, ringent; peristome slightly reflected, its terminations converging, joined by a triangular, tooth like, two-forked callus, the right-hand margin with one subvertical lamina, the columel- lar margin with tv. o acute denticles. Greater diameter 8, lesser 7""^; height, 4^'""'. EeHx Eindsi, Pfeiffer, in Proc. Zool. Soc, 1845, 132; Mon. IIcl. Viv., ; in Chemnitz, ed. 2, i, 373, tab. Ixv, figs. 7,
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