UNITED STATES GEOLOGICAL SURVEY 



CHAKLKS 1). WALOdTT, DIliKCTOR 



A SYNOPSIS 



OP 



AMERICAN FOSSIL BRYOZOA 



INCLUDING 



BIBLIOGRAPHY AND SYNONYMY 



BY 



JOHN M. NICKLES AND RAY S. BASSLER 



WASHINGTON 



GOVEKNMENT PRINTING OFFKJE 

 1900 



