CONTENTS. 



PAGE 



Officers and Committees for 1889 iv 



Officers and Committees for 1890 v 



Joint Commission for 1890 vi 



Proceedings, February u, 1888, to January 24, 1890 .... vii-xxiv 



Addresses and Communications : 



Deep Sea Mollusks and the Conditions under which they 



Live, by \V. H. Dall (May 2, 1890*) 1-22 



The Course of Biologic Evolution, by Lester F. Ward (May 



2, I8 9 0*) 23-55 



* Author's separates of the papers especially enumerated were published on the dates 

 given in the parentheses following- the author's name. 



Ill 



