PLATE XXII. 



Page. 

 Unio sp 95 



Fig. 1. A small right valve. 



Nat. Mus. Cat. Invert. Foss., 22877. 



Lucina JUVENISn.Sp 98 



Nat. Mus. Cat. Invert. Foss., 22878. 

 Figs. 2, 3. Opposite views of one of the types, enlarged. 



4. Left valve of another more convex specimen, enlarged. 

 Lucina subundata H. & M. ? 97 



Nat. Mus. Cat. Invert. Foss., 22879. 

 Fig. 5. Small right valve retaining portions of the natural surface. ♦ 

 6. Left side view of one of the largest casts. 

 Cardium trite White 100 



Fig. 7. Cast of right valve (after White). 



8. Portion of the surface, magnified (after White). 



Cardium pauperculum Meek 99 



Fig. 9. Anterior view of both valves, enlarged. 

 Nat. Mus. Cat. Invert. Foss., 22880. 



10. Left valve from Bear River city, Wyoming, enlarged. The surface 



is slightly eroded, so that the ribs appear unnaturally broad. 

 Nat. Mus. Cat. Invert. Foss., 22881. 



11. Right valve from Huerfano park, Colorado, enlarged. 



Nat. Mus. Cat. Invert. Foss., 22880. 



12. Small right valve of broad variety from Coalville, Utah. 



Nat. Mus. Cat. Invert. Foss., 22882. 



Cyrena iNFLEXAMeek 103 



Fig. 13. Right valve of one of the types (after White). 



Cyrena ^equilateralis Meek? 102 



Fig. 15. A left valve doubtfully referred to the species. 

 Nat. Mus. Ca. Invert. Foss., 22883. 

 14. Hinge of same. 



236 





