Ill 



werk); Lilycash (h-eek, Will Co. ( Handwerk ) ; t'ook Co. ( Hig- 

 ley, Nasoii); AVinnebago Co. (Hinkley) ; Mener ( 'o, (Marsh): 

 Algonquin, McHenry Co.: Athens, Menard Co. (Nason); Auro- 

 ra, Kane Co. ((Jakes): Fulton Co. (Wolf). 



Genus Bifidaria 8terki. 



Section Bifiihirin .v.x. 



Blfiddrid corticarut Say. 



Northern Illinois (Calkins): La Salle Co. ( Calkins, Ihiett ) : 

 Sheridan, La Salle Co. (Ferriss); Mt. Carniel, ^\'a!lash Co. 

 (Gratacap): Washington Co. (Hinkley); Will C'o. (Marsh); 

 Fulton Co. (Wolf). 



Bifidnria procera Gould (= rnpicola of antlio;-^ not of Say). 



Joliet, Will Co.; Du Page Co. (Ferriss)- Will Co.' (Marsh); 

 Fulton Co. (Wolf). 



Secti'in Alhiiiiil.i Stfi-ki. 



Bifidaria arm if era Say. 



Oregon, ()gle Co. (Baker): Cook Co. (Baker, Iiii;ley, .Jensen) 

 Northern Illinois (Calkins): La Salle Co. ( Calkins, Iluett) 

 Peoria Co. (Chamberlain) ; Stark Co. (Chase) ; .loliet, Will Co. 

 Utica, La Salle Co. ( F'erriss, Handwerk ) ; Winnebago and 

 Washington counties (Hinkley) ; Mercer Co. (Rhu-sh); Elgin, 

 Kane Co. : Algonquin, McHenry Co. ; Athens, Menard Co. 

 (Nason) : Fulton Co. (Wolf) ; Hlinois Kiver, Havana, .Mason (_'o. 

 (State Laboratory). 



Bifidaria contract a Say. 



Oregon, Ogle ('o. (Baker): Cook Co. (Baker, .Iensen);La 

 Salle Co. (Calkins); Stark Co. (Chase); Joliet, Will Co. ( P'er- 

 riss, Handwerk); Mt. Carniel, Wabash Co. (Gratacap); Wash- 

 ington Co. (Hinkley); Mercer Co. (Marsh); Elgin, Kane Co. : 

 Algonquin, McHenry Co. ; Athens, Menard Co. ( Nason ) ; South- 

 ern Illinois ( Ultl'ers ) : Fulton Co. (Wolf ): Havana, Mason Co. 

 (State Laboratory). 



Bifidaria holzingeri Sterki. 



Joliet, Will Co. (Ferriss, Handwerk): Northern Illiiu)is: Will 

 and La Salle counties (Ferriss, Sterki ) : \\"\\\ Co. i Marsh ). 



