522 NON-MA"RINE FOSSIL 



PLATE 18. LARAMIE. 

 UNIO DANJS Meek & Ilayden? (Page 433.) 



FiO. 1. Exterior view of the right valve of an example from Black Buttes Station, 



Southern Wyoming. 



FIG. 2. Interior view of a left valve from the same locality. 

 (Both natural size.) 



UNIO MENDAX White. (Page 433.) 



FIG. 3. Exterior view 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^ill natural size.) 



CORBULA UNDIFERA Meek. (Page 440.) 



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 440. ) 



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

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



CORBULA MACTRIFORMIS M. & H. (Page 440.) 



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.) 



