P/ii/sa sp. 



Greenhouse, Douglass Park, CliiraLTf), Cook Co. (Hood, Zetek). 

 Geiuis Aplkxa Fleming. 

 Aplexa hypnorum Linne ( = PhijHa elongatn Say). 



Cook Co. (Baker, Higley,Nason ) ; Northern Illinois (Calkins) : 

 Desplaines River (Ferriss): Kockford, Winnebago Co. (Hink- 

 ley) ; La Salle Co. (Huett) : Canton, Fulton Co (Lewis) : Eastern 

 Illinois (Marsli); Elgin, Kane (^o.; Algonquin, McHenry Co. : 

 Canton, Fulton do. (Nason); shores of Illinois (Say); Soutiiern 

 Illinois (Ulllers); Fulton Co. (Wolf). 



Family AN(!YLID^. 

 Genus Ancylus Geoifroy. 

 Section r.imipn Walker. 

 A/iri/his (linphjinus Haldeman. 



Illinois iviver (Ferriss, Walker). 

 Ancylus t'lisriis Adams. 



Algonquin and Fox Lake, McHenry Co. (Nason). 

 An.i'yJu.s fusciis ei/i/Iy/ifihs Pilsbry. 



Havana, Mason Co.: Illinois River (Pilshry)- 

 Ancylus kirl'lantli Walker. 



Havana, Mason Co.; Crystal Lake, Urbana, Champaign Co. 

 (State Laboratory). 



Section Frrrlssln Walker. 

 Ancylus ricularis Say. 



Du Page River (Ferriss) ; Winnebago and Washington coun- 

 ties (Hinkley) ; Cook Co. (Jensen) ; ]\Iercer ('o. (Marsh) ; creek, 

 Algonquin, .McHenry Co. ; Fox River, Elgin, Kane Co. (Nason) ; 

 Salt Fork, I'rbana, Champaign Co. (State Laboratory). 

 Aiicijlus piirallclus Haldeman* 



Algonquin, McHenry Co. (Nason) ; Pistakee and Odar lakes, 

 Lake Co. (State Laboratory). 



Ancylus tardus Say. 



Northern Illinois; La Salle Co. (Calkins, Huett) ; Du Page 

 River (Ferriss) ; Winnebago Co. (Hinkley ) ; Mercer Co. (Marsh) ; 

 creek, Algonquin, McHenry Co. (Nason); Rockford, Winnebago 



Aiici/liis jiiirii/lflns Haldeman as qnoteil by Marsh from Mercer Co., is saiil by 

 Walker to be .1. hinlii.-;. ( Naiitiint' Will., ]<. 7ii. ) 



