510 NON-MARINE FOSSIL MOLLUSC A. 



PLATE 12. LARAMIE. 

 OSTREA GLABRA Meek & Hay den. (Page 4:21.) 



FIG. 1. Interior view of an under valve of the variety 0. wyoming&nsis Meek ; from 

 Point of Rocks, Southern Wyoming. Natural size. 



OSTREA SUBTRIGONALIS Evans & Shumard. (Page 421.) 



FIG. 2. "Exterior view of a lower valve. 



FIG. 3. Interior view of another example of the lower valve. 

 FIG. 4. Exterior view of an upper valve. 

 FIG. 5. Interior view of the same. 

 (All natural size. ) 



ANOMIA MICRONEMA Meek. (Page 422.) 



FIG. 6. Exterior view of an upper valve, showing radiating lines of ordinary char- 

 acter. 



FIG. 7. Similar view of another example, the lines upon which are very fine, and less 

 conspicuous than they appear upon the figure. 



FIG. 8. Similar view of another example, having radiating lines much coarser than 

 usual. 



FIG. 9. Interior view of a large, nearly flat, upper valve, showing the four muscular 

 scars, and the process beneath the beak. 



FIG. 10. Similar view of another example, showing the process more plainly ; but the 

 scars are obliterated. 



FIG. 11. Interior view, showing the under valve, with its byssal plug. 

 (All natural size. ) 



ANOMIA GRYPHORHYNCHUS M. (Page 422. ) 



FIG. 12. Exterior view of a lower valve. 



FIG. 13. Similar view of two other valves. 



FIG. 14. Lateral view of Fig. 12. 



FIG. 15. Interior view of an upper valve, showing the muscular markings and the 



small process beneath the beak. 

 (All natural size. ) 



