NON-MARINE FOSSIL MOLLUSCA. 549 



PLATE 32. MIOCENE AND PLIOCENE? 



MELANIA SCULPTILIS Meek. (Page 461.) 

 FIG. 1. Lateral view, natural size. After Meek. 



MELANIA SUBSCULPTILIS M. (Page 461.) 

 FIG. 2. Lateral view, natural size. After Meek. 



MELANIA TAYLORI Gabb. (Page 461.) 

 FIG. 3. Lateral view, natural size. After Gabb. 



LITHASIA ANTIQUA G. (Page 465.) 



FIG. 4. Lateral view, showing the aperture, natural size. After Gabb. 

 CARINIFEX (VORTICIFEX) BINNEYI M. (Pago 448.) 



FIG. 5. Lateral view, natural size, showing the aperture. 

 FIG. 6. Upper view of the same example. After Meek. 



CARINIFEX (VORTICIFEX) TRYONI M. (Pago 448.) 



FIG. 7. Lateral view, natural size, showing the aperture. 

 FIG. 8. Upper view of the same example. 

 FIG. 9. Under view of the same. After Meek. 



ANCYLUS UNDULATUS M. (Page 451.) 



FIG. 10. Upper view and lateral outline, natural size. After Meek. 

 SPH^RIUM RUGOSUM M. (Page 440.) 



FIG. 11. An example of not quite adult size, enlarged two diameters. 



FIG. 12. A larger example, enlarged two diameters. 



FIG. 13. Outline showing the convexity of the valves. After Meek. 



SPILERIUM IDAHOENSE M. (Page 440.) 



FIG. 14. An imperfect example, natural size. 



FIG. 15. Outline showing the convexity of the valves. After Meek. 



PLANORBIS VETUSTUS Meek & Haydeu. (Page 448.) 



FIG. 16. Under view, natural size. 



FIG. 17. Upper view of the same example, enlarged. 



FIG. 18. Peripheral view of the same, more enlarged. After Meek. 



PLANORBIS LEIDYI M. & H. (Page 448.) 



FIG. 19. Upper view, natural size. 



FIG. 20. Peripheral view of the same, enlarged, showing the aperture. 



FIG. 21. Under view of the same, less enlarged. After Meek. 



PLANORBIS NEBRASCENSIS Evans & Shumard. (Page 448.) 



FIG. 22. Upper view, natural size. 



FIG. 23. Peripheral view of the same, enlarged. After Meek. 



