500 NON-MARINE FOSSIL MOLLUSC A. 



PLATE 7. BEAR RIVER LARAMIE. 

 UNIO VETUSTUS Meek. (Page 430.) 



FIG. 1. Left side view of a large example; a little compressed laterally. 

 FIG. 2. Right side view^ the posterior portion a little compressed vertically. 

 FIG. 3. Dorsal view of Fig. 2 ; the left valve restored in symmetry with the right. 

 FIG. 4. Interior view of a left valve. 

 (All natural size.) 



NERITINA NATICIFORMIS White. (Page 458.) 



FIG. 5. Lateral view ; enlarged. 

 FIG. 6. Opposite view of the same. 



GOXIOBASIS ENDLICHI W. (Page 463.) 



FIG. 7. Lateral view ; revolving lines faint. 

 FIG. 8. Another example ; revolving lines obsolete. 



FIG. 9. Apical portion of another example ; revolving lines unusually distinct. 

 (All natural size.) 



