106 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 13. LARAMIE. 



Volsetxa (Brachydontes) kegulakis White. (Page 17.) 



Fig. 1. Right valve, natural size. 



Volsella (Brachydontes) laticostata W. (Page 17.) 



Fig. 2. Right valve, natural size. 



Umo proavitds "W. (Page 27.) 



Fig. 'i. 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 va.lve. 

 (All natural size.) 



Unto goinonotus W. (Page 27.) 



Fig. 7. Right side view. 

 Fig. 8. Front view of another example. 

 Fig. 9. Left side view of youug example. 

 Fig. 10. Dorsal view of the same. 

 (All natural size.) 



