528 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 21. LARAMIE. 

 CORBICULA BERTnouDi White. (Page 438. ) 



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

 FIG. 2. Dorsal view of another example. 

 FIG. 3. Interior view of a left valve. 

 (All natural size ) 



CORBICULA AUGHEYI W. (Pago 433.) 



FIG. 4. Exterior view of a right valve. 

 FIG. 5. Interior view of the same. 

 FIG. 6. Dorsal view of another example. 

 (All natural size.) 



CORBICULA UMBONELLA Meek. (Pago 438.) 



FIG. 7. Exterior view of a left valve. 



FIG. 8. Interior view of the same. 



FiG. 9. Dorsal view of another example. 



FIG. 10. Front view of the same. 





 CORBICULA (LEFTESTIIES) MACROPISTIIA W. (Pago 437.) 



FIG. 11. Left side view of an adult example. 

 FIG. 12. Dorsal view of the same. 

 FIG. 13. Left side view of another example. 

 FIG. 14. Interior view of a left valve 



