120 NON-MARINE FOSSIL MOLLUSCA 



PLATE 20. LARAMIE. 



Corbicula (Leptesthes) fracta Meek. (Page 33.) 



Fig. 1. Copy of Mr. Meek's original figure. 



Fig. 2. Left side view of a robust example. 



Fig. 3. Dorsal view of the same. 



Fig. 4. Left side -view of a young example. 



Fig. 5. Dorsal view of the same. 



Fig. 6. Left side view of a more elongate, partially crushed example. 

 (All natural size.) 



CORBICULA clkbukni White. (Page 31.) 



Fig. 7 Left side view of an adult example. 

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

 Fig. 9. Interior view of the same. 

 (All natural, size.) 



Corbicula subelliptica Meek & Hay den. (Page 31.) 



Fig. 10. Exterior view of a right valve; natural size. 

 Fig. 11. Interior view of the same. 



Corbicula nebrascensis M. & H. (Page 31.) 



Fig. 12. Exterior of a left valve; natural size. 

 Fig. 13. Interior view of the same. 



Pisidium saginatum W. (Page 34.) 



Fig. 14. Lateral view, enlarged. 

 Fig. 15. Front view of the same. 



