PLATE IX. 



Papo. 



Plicatula ttydrotheca "White 69 



Figs. 1, 2. Views of the opposite valves (after White). 



Plicatula akenaria Meek 70 



Figs. 3,4. Views of the under and upper valves (after Meek). 

 Lima utahensis n. sp 71 



Fig. 5. Cast of a large left valve. 



Nat. Mus. Cat. Invert. Foss., 22942. 



Camptonectes platessa White 72 



Fig. 6. Right valve of the type (after White). 



Avicula gastrodes Meek 72 



Nat. Mus. Cat. Invert. Foss., 22866. 

 Fig. 7. Large left valve restored from two specimens which together show all 

 the features drawn. 



8. A small left valve. 



9. 10. Two views of a more oblicjue specimen,, 



210 



