CONTENTS. 



PAGE 



Officers and Committees for 1S89 ■ iv 



Officers and Committees for 1890 v 



Joint Commission for 1S90 vi 



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



Addresses and Communications : 



Deep Sea Mollusks and the Conditions under which they 



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



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



2, 1890*) 23-55 



* Author's separates of the papers especially enumerated were published 011 the dates 

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



Ill 



