516 NON-MARINE FOSSIL MOLLUSC A. 



PLATE 15. LARAMIE. 

 Uxio ENDLICIII White. (Page 432.) 



FIG. 1. Right valve of a large example, exterior view. 

 FIG. 2. Interior view of a smaller left valve. 

 (Both natural size.) 



UNIO PROPHETICUS W. (Page 433.) 

 Fio. 3. Exterior view of a left valve. Natural size. 



UNIO ALDRICHI W. (Page 433.) 

 FIG. 4. Left side view. 



FIG. 5. Dorsal view of the same. Natural size. 



