PSEPH. 



792 



tooth from right lower jaw, inner] margin; <?, outer; d^ front 



Kind, 

 Limf. 



Si Jo ham 

 Qeol JUhi' 



side border, showing fold of the crown ; ^, hind-side border, 

 showing broad waves ; 25, d^ upper jaw middle tooth ; 3d, c, 

 from left lower jaw; 5 ^, J, very small shortened tooth. Kin- 

 derhoolc {subcarhoniferous) limestone, Burlington, Iowa. XI, 



Psephodus placenta, St. John and Worthen, Geo. Sur. 111. 



Shim 



l^o/M/'U 



