120 On the Sexual Characters of the Family of Naiades. 
ris of Barnes; and the U. ridibundus of Say, the female of the U. 
sulcatus of Lea. 
Ihave been essentially aided in my investigations of this matter 
by my friend Charles C. Cooke, M. D., of Youngstown. 
Uventricosus 
gy SHINSUUL TY 
LMIUYIO 2) 
rectus. 
B 
