SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 90 



A MONOGRAPH OF THE MOLLUSCAN FAUNA OF 



THE ORTHAULAX PUGNAX ZONE OF THE 



OLIGOCENE OF TAMPA, FLORIDA 



WILLIAM HEALEY DALL 

 Curator, Division of Mollusks, United States National Museum 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1915 



