512 NON-MAKINE , FOSSIL MOLLUSCA. 



PLATE 13. LARAMIE. 



VOLSELLA (BRACHYDONTES) RKGULARIS White. (Page 423.) 

 FIG. 1. Right valve, natural size. 



VOLSELLA (BRACHYDONTES) LATICOSTATA W. (Page 423.) 

 FIG. 2. Right valve, natural size. 



UNIO PROAVITUS W. (Page 433.) 



FIG. 3. Left valve, exterior view. 

 FIG. 4. Similar view of right valve. 

 FIG. 5. Front view of another example. 

 FIG. 6. Interior view of a left valve. 

 (All natural size.) 



UNIO GOINONOTUS W. (Page 433.) 



FIG. 7. Right side view. 

 FIG. 8. Front view of another example. 

 FIG. 9. Left side view of young example. 

 FIG. 10. Dorsal view of the same. 

 (All natural size.) 



