498 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 6. BEAR RIVER LARAMIE. 

 UNIO BELLIPLICATUS Meek. (Page 430.) 



FIG. 1. Left side view, natural size. 

 FIG. 2. Similar view of another example. 



FIG. 3, Dorsal view of a left valve, a little distorted, showing the plications of the 

 umbo. 



PYRGULIFERA HUMEROSA M. (Page 460.) 



FIG. 4. Lateral view of a large example, natural size. 



FiG. 5. Opposite view of the same. This is the same example that is figured by Meek 



on p. 177 U. S. Geol. Sur. 40th Parallel, vol. iv, but it has since been cleaned 



of extraneous matter. 

 FIG. 6. Lateral view of a smaller example. 



GONIOBASIS CLEBURNI White. (Page 462.) 



FIG. 7. Lateral view, natural size. . 

 FIG. 8. Similar view of another example. 

 FIG. 9. Fragment of a large example. 



GONIOBASIS CHRYSALLOIDEA W. (Page 462. ) 



FIG. 10. Lateral view, natural size. 



FIG. 11. Similar view of another example. 



GONIOBASIS MACILENTA W. (Page 462.) 



FIG. 12. Lateral view, enlarged. 



GONIOBASIS CHRYSALIS M. (Page 462.) 



FiG. 13. Lateral view, enlarged. 



FIG. 14. Similar view of another example. ^ 



LlMNJEA (LlMNOPHYSA) NITIDULA M. (Page 445.) 



FIG. 15. Lateral view, enlarged two diameters. 

 FIG. 16. Opposite view of the same. 



PH YSA ? (Page 449. ) 



FIG, 17. Lateral view, natural size. 



LlMNJSA (ACELLA) HALDEMANI W. (Page 445.) 



FIG. 18. Lateral view, enlarged. 

 FIG. 19. Opposite view of the same. 



