VOL. VII. JANUARY, 1921 NO. 
american MITDLAND 
NATURALIST 
Devoted to Natural History, Primarily 
that of the Prairie States 
Published by the University of Notre Dame, 
Notre Dame, Indiana 
J. A. NIEUWLAND, C.S.C., Ph. D., Sc. D., Editor 
V, 
CONTENTS 
A Preliminary Report on the Uniondae of St. Joseph 
River. Francis Wenninger 
Notes on the Genus Atrypa, with Descriptions of New 
Species. Clement L. Webster, M. Sc.. 13 
The Winters of North-Central Iowa. 
Howard Clark Brown 21 
Birds Observed at Rum Village on October 7, 1920. 
Brother Alphonsus, C. S.C. 26 
Indiana Audubon Society. 
Frank C. Evans 28 
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authorized on July 3, 1918. 
THE UNIVERSITY PRESS, NOTRE DAME, INDIANA 
