rNlTKn STATKS & MKXICAN BorNDARY paljeontoloct/ 



( CxCTaceoiis ) 



JJ^cL. 



f 





/ 



F . B . Meek del . 



Gavit sc. 



1 exOCYRA MATHERONIANA 2 EXOCYRA FRAGOSA 3 EXOCYRA COSTATA VAR 



