136 NON-MAblNE FOSSIL MOLLUSCA. 



PLATE 28. EOCENE. 



Unio clinopisthus White. (Page 28.) 



Fig. 1. Left side view, natural size. 

 Fig. 2. Dorsal view of the same. 



Unio shosijonensis W. (Page 29. ) 



Fig. 3. Left side view, natural size. 



Unio haydexi Meek. (Page 29.) 



Fig. 4. Right side view, natural size. 



Fig. 5. Left side view of a smaller example. 



Unio washakiensis M. (Page 29.) 



Fig. li. Left side view, natural size. 



Fig. 7. Eight side view of a sandstone cast. 



Fig. 8. Interior view of a fragment of a right valve. 



Unio tellinoides Hall. (Page 29.) 



Fig. 9. Copy of Hall's original figure. 



Planohbis (Gyraulus) militaris W. (Page 41.) 



Fig. 10. Upper view, enlarged. 



Fig. 11. Under view of the same example. 



Bythinella gregaria M. (Page 60.) 



Fig. 12. Lateral view, enlarged. 

 FlG. 13. Opposite view of the same.' 



Bulimus floridanus Conrad. (Page. 48.) 



Fig. 14. Copy of Conrad's original figure. 



Melania claibornensis Heilprin. (Page 54.) 



Fig. 15. Lateral view, much enlarged, together with an outline of natural size. After 

 Heilprin. 



