508 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 11. LARAMIE. 



OSTREA GLABRA Meek & Hayden. (Page 421.) 



FIG. 1. Exterior view of an upper valve of the variety 0. wyomingensis Meek, from the 



valley of the South Platte, Colorado. 

 FIG. 2. Interior view of the same. 

 FIG. 3. Exterior view of an example of the upper valve of the same variety, from Point 



of Rocks, Southern Wyoming. 

 FIG. 4. Interior view of the same. 

 (AH natural size.) 



