Report of the United States Geological Survey of the territories . Thaumastus limjlikormis 558 8, a. Dorsal side of type-specimen. 8, b. Aperture view of same; the thin inner lip being broken away above. * 8, c. A dorsal view of a somewhat narrower specimen. 8, d. An aperture view of same; its thin iuner lip above the middle being broken away. Fig. 9. Planorbis planoconvexus . 538 9,0. An upper or right-side view of the type-specimen, which is mainly an internal cast. 9, b. An aperture view of same. 9, c. An under or umbilical view of same. Fig. 10. Acroloxus minutus 543 Type-specimen, magnifi
Report of the United States Geological Survey of the territories . Thaumastus limjlikormis 558 8, a. Dorsal side of type-specimen. 8, b. Aperture view of same; the thin inner lip being broken away above. * 8, c. A dorsal view of a somewhat narrower specimen. 8, d. An aperture view of same; its thin iuner lip above the middle being broken away. Fig. 9. Planorbis planoconvexus . 538 9,0. An upper or right-side view of the type-specimen, which is mainly an internal cast. 9, b. An aperture view of same. 9, c. An under or umbilical view of same. Fig. 10. Acroloxus minutus 543 Type-specimen, magnified about four 11. Columna teres . 555 11, a. Type-specimen, dorsal view, natural size. 11, b. The same, magnified. Fig. 12. Columna vermicula 556 12,a. Type-specimen, natural ,6. The same, magnified. FlG. 13. LlMNJEA (PLEUROLIMANiEA) TENUICOSTATA 534 13, o. Dorsal view of type-specimen, natural size. 13,6. The same, magnified. 13, e. Body-volution of same, more highly magnified, to show surface-markings. N U,^.(rn-aliHncal§u: i . ILATK 1-. PLATE 45. Page. Fig. 1. Planorbis vetustus 001 1, it. Left side of the type-specimen, natural , b. Right side, same, magnified. 1, c. An aperture view of same, a little more enlarged. Fig. 2. Planoebis Nebrascensis GOO 2, a. Right side of type-specimen, magnified about two diameters. 2, J. An aperture view of the same, more, highly magnified. [Not represented quite angular enough around (he periphery.] Fig. 3. Planoebis Leidyi 599 3,<i, An under or left-side view of type-specimen, natural Bize. 3, b. An upper-side view of same. 3, c. An aperture view of same, ,<i. An umbilical view of same, less magnified. Fig. 4. Physa secalina 004 4. a. An aperture view, magnified about three diameters. 4, b. An opposite view of same. Fig. 5. Meekiana 598 5, a. An aperture view of a , ft. An opposite view of same. 5, c. A dorsal view of an imperfect larger specimen. Fig. C. Shumakdi 599 6,
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1876
