/ 



BULLETIN ' 



OF THE 



DES MOINES ACADEMY OF SCIENCE. 



CONTENTS: 



ARTICLE I.-INTRODUCTORY. 



ARTICLE II. A GEOGRAPHIC CATALOGUE OF 



THE UNIONID^ OF THE MISSISSIPPI 

 VALLEY. 



PUBLISHED BY THE ACADEMY. 



VOLUME L NUMBER I. 



DES MOINES, IOWA, 

 MARCH, 1885. 



