DESCRIPTION OF PLATE LXX— Continued. 595 



Page. 

 Fig. 7. jReticularia (?) subrotundata 557 



a. View of a ventral valve, 

 ft. Side view of same. 



Madison limestone, near Monarch, Montana. 



Fig. 8. Keticularia (?) peculiaris 557 



a. Ventral valve, identified by White with Shumard's species ; after White. 

 6. Side view of same; after White. 



Waverly age, Mountain Spring, Old Mormon road, Nevada. 



Fig. 9. Beticularia cooperensis 555 



a. A dorsal valve, identified as It. cooperensis. 



Madison limestone. Crowfoot Ridge, Gallatin Range, top of bed 26. 

 ft. A ventral valve from another locality, 

 c. Side outline of same. 



Madison limestone, Crowfoot Ridge, Gallatin Range, upper part of bed 27. 



