536 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 25. LARAMIE. 

 PHYSA COPEI White. (Pago 450.) 



FIG. 1. Lateral view, natural size. 

 FIG. 2. Opposite view of the same. 



PIIYSA FELIX W. (Page 450.) 

 FIG. 3. Lateral view of an imperfect example, natural size. 



BULINUS DISJUNCTUS W. (Page 451.) 



FIG. 4. Lateral view, natural size. 

 FIG. 5. Opposite view of the same. 



BULINUS ATAVUS W. (Page 450.) 



FIG. 6. Lateral view, natural size. 

 FIG. 7. Opposite view of the same. 



BULINUS LONGINSCULUS Meek & Hayden. (Page 451.) 

 FIG. 8. Two lateral views of the same example, natural size. After Meek. 



BULINUS RHOMBOIDEUS M. & H. (Page 451.) 

 FIG. 9. Lateral view, natural size. After Meek. 



BULINUS SUBELONGATUS M. & H. (Page 450.) 



FIG. 10. Lateral view, natural size. 



FIG. 11. Opposite view of the same. After Meek. 



HELIX KANABENSIS W. (Page 454.) 



FIG 12. Lateral view of an internal cast of the last volutions, showing the grooves left 



by the internal ridges near the aperture ; natural size. 

 FIG. 13. Upper view of the same. 

 FIG. 14. Under view of the same. 



COLUMNA TERES M. & H. (Page 454. ) 

 FIG. 15. Lateral view, natural size, and enlarged. After Meek. 



COLUMNA VERMICULA M. & H. (Pago 454.) 

 FIG. 16. Lateral view^ natural size, and enlarged. After Meek. 

 VIVIPARUS PRUDENTIUS W. (Page 467.) 



FIG. 17. Lateral view, natural size. 

 FIG. 18. Opposite view of the same. 



VIVIPARUS PANGUITCHENSIS W. (Page 467.) 



FIG. 19. Lateral view of an internal cast. 



FIG. 20. Opposite view of another example, showing a part of the surface markings. 



FIG. 21. Lateral view of another example, showing a portion of the natural surface 



of the shell. 

 (All natural size.) 



VIVIPARUS REYNOLDSIANUS M. & H. (Page 407.) 



FIG. 22. Lateral view, natural size. 



FIG. 23. Opposite view of the same example. 



TlIAUMASTUS LIMNyEIFOKMIS M. & II. (Page 454.) 



FIG. 24. Apcrtural and opposite views of an example not quite aduU; natural size. 



