1 10 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 15. LARAMIE. 

 TJnio endlichi White. (Page 26.) 



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

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

 (Both natural size.) 



Unio pkophkticus W. (Page 27.) 



Fig. 3. Exterior view of a left, valve. Natural size. 



Unio aldrichi W. (Page 27.) 

 FlG. 4. Left side view. 

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



