CONTENTS. 5 



Species and varieties of Exogyra from the eastern Gulf region and the Carolinas — Continued. 

 Systematic descriptions — Continued. . 



Genus Exogyra Say — Continued. Page. 



Exogyra costata Say 50 



Description 51 



Kemarks 51 



Geologic occurrence 51 



Localities 52 



Exogyra costata var. cancellata var. nov 53 



Description 53 



Remarks 53 



Geologic occurrence 54 



Localities 54 



Index 75 



INSERTS. 



Page 

 Tables 2 to 9 . Range of Cretaceous fossils 24 



