502 NON-MARINE FOSSIL MOLLU8CA. 



PLATE 8. BEAR RIVER LARAMIE. 

 VIVIPARUS COUESII White. (Page 467.) 

 FiO. 1. Lateral view of a very large example, natural size. 



RHYTOPHORUS PRISCUS Meek. (Page 444.) 



FIG. 2. Lateral view, natural size. 



FIG. 3. Opposite view of the same. After Meek. 



RHYTOPHORUS MEEKII W. (Page 444.) 



FIG. 4. Lateral view, natural size. 



FIG. 5. Opposite view of a larger example. 



CAMPKLOMA MACROSPIRA M. (Page 469.) 



FIG. 6. Lateral view, natural size. 



FIG. 7. Opposite view of the same. , 



CORBICULA (VELORITINA) DURKEEI M. (Page 437.) 



FIG. 8. Left valve. 



FIG. 9. Similar view of another example. 

 FIG. 10. Dorsal view of another example. 

 FIG. 11. Front view. 



(All natural size.) 



CORBULA PYRIFORMIS M. (Page 441.) 



FIG. 12. Right side view. 

 FIG. 13. Dorsal view of the same. 

 FIG. 14. Front view of the same. 

 FIG. 15. Interior view of a right valve. 

 FIG. 16. Interior view of a left valve. 

 (All natural size.) 



