684 NEW YORK STATE MUSEUM 



PLATE 8 



Orbiculoidea ? magnifica Clarke 

 p. 615 



(See pi. 7) 



FIG. 



1 A large depressed' conical shield believed to represent the 

 brachial valve of this organism. Drawn from a plaster 

 cast. 

 Ithaca beds. Truxton N. Y. 



