. Bulletin - United States National Museum. Science. 380 A MANUAL OF AMERICAN LAND SHELLS. whorl. The internal revolving lamina easily distinguishes the species. Fig. 413 represents a specimen broken so as to show the internal lamina. Jaw as usual; 14 ribs. There are 22-1-22 teeth, with 9 laterals, on the lingual membrane, the inner cutting point of the tenth tooth being bifid. Marginals with base of attachment low, wide, with one inner, long, oblique, bifid cut- ting point and one short, bluntly bifid, small, outer cutting point (Terr. Moll., V, Plate VI. Fig. K), all of same type as in septe
. Bulletin - United States National Museum. Science. 380 A MANUAL OF AMERICAN LAND SHELLS. whorl. The internal revolving lamina easily distinguishes the species. Fig. 413 represents a specimen broken so as to show the internal lamina. Jaw as usual; 14 ribs. There are 22-1-22 teeth, with 9 laterals, on the lingual membrane, the inner cutting point of the tenth tooth being bifid. Marginals with base of attachment low, wide, with one inner, long, oblique, bifid cut- ting point and one short, bluntly bifid, small, outer cutting point (Terr. Moll., V, Plate VI. Fig. K), all of same type as in septemvolva. Genitalia as in P. septemvolva. Polyifyra Carpenteriana, Bland. Shell umbilicate, orbicular, horn-colored or pale rufous, above flat, Fig 414. obllqucly and acutely ribbed, beneath convex, slightly striated, shining, often ornamented with indistinct white spots; suture deeply impressed; whorls 5J to 6^, the last subangular at the periphery, shortly but suddenly de- flected at the aperture, gibbous, scrobiculate, constricted, tumid behind the aperture and ribbed, base dilated, with a white, internal, thread-like lamina* on the columellar wall near the point of attachment of the aperture; aper- ture very oblique, lunate; peristome callous within, enlarged. ' thickcned, little reflected, the margins joined by a trian- gular dentiform lamella. Greater diameter 10, lesser 9"""; height, 4""", Helix microdonta, Pfeiffer, Mod. Hel. Viv., 499, ex parte? (1848).—W. G. Binney, Terr. Moll., iv, 91, pi. Ixxviii, fig. 28, excl. fig. Helix Carpenteriana, Blaxd, Aun. N. Y. Lye, vii, 137.—W. G. Binney, L. & Sh., i, 107, fig. 183 (1869). Polygyra Carpenteriana, Thyon, Amer. Joiirn. Conch., iii, 159, pi. xi, fig. 24, not 23 (1867).—W. G. Binney, Terr. Moll., v, 284. In the Florida Subregion, on the mainland of the extreme southern part of the i)eninsula and on the keys from Little Sarasota Bay to Key Biscayne; Lake Harvey. I have received fos
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