116 NON-MARINE FOSSIL MOLLUSC A. 



PLATE 18. LARAMIE. 



Unio dajst^e Meek & Hayden? (Page 27.) 



Fig. 1. Exterior view of tlie right valve of ;in example from Black Buttes Station, 



Southern Wyoming. 

 Fig. 2. Interior piew of a left valve from the same locality. 

 (Both natural size.) 



Unio mendax White. (Page 27.) 



Fig. 3. Exterior vie \v of a left valve ; adult. 

 Fig. 4. Similar view of a smaller right valve. 

 Fig. 5. Interior view of part of a right valve. 



(All from the Canon of Desolation, Utah; and all natural size.) 



CORBULA UNDIFERA Meek. (Page 36.) 



Fig. 6. Right side view of an adult example. 



Fig. 7. Dorsal view of the same. 



Fig. 8. Left side view of a smaller example. 



Fig. 9. Front view of the same. 



CORBULA UNDIFERA var. SUBUNDIFERA W. (Page 36.) 



Fig. 10. Left side view of the type specimen. 

 Fig. 11. Dorsal view of the same, natural size. 



Corbtjla mactriformis M. & H. (Page 36.) 



Fig. 12. Exterior view, left valve. 

 Fig. 13. Interior view of the same. 

 Fig. 14. Dorsal view of the same. 



Fig. 15. Interior view of the right valve of another example. 

 (All natural size, and all after Meek.) 



