76 



Genus Hemilastena (Agassiz) Simi)Soii. 



Hcmilastena anihigua Say { — hlldrethiana Lea). 



Cook Oo. (Baker); Kankakee River, V/ilmington, Will ('o. 

 (Ferriss, Handwerk); Hickory Creek, Will Co. ( Handvverk ) ; 

 Wabash River: Mercer Co. (Marsh) ; Spoon River (Strode). 



Genus Margaritana Schumacher. 



Margaritana marffaritlfera Linne. 

 Illinois River (Calkins). 



MargarUana monodojita Say (= soIenifo7'mis Lea). 



Northern Illinois (Calkins); Mercer Co. (Call, Marsh); Kan- 

 kakee River (Ferriss, Handwerk) ; Mississippi River, (i^uincy, 

 Adams Co. (Hart); Mississippi River (Marsh ) ; Southern Illi- 

 nois (Ulffers); Fulton t!o. (Wolf); Havana, Mason Co. (State 

 Laboratory). 



Genus Unio Retzius.* 



Section Eniptio Rafinesque. 

 Unio gibhosus Barnes (= ^nvi/or Lea). 



Oregon, Ogle Co.; Savanna, Carroll Co. ( Baker) ; Cook Co. 

 (Baker, C^alkins, Higley, Nason); Northern Illinois (Calkins) ; 

 Kankakee River (Ferriss, Handwerk); Illinois and Du 

 Page rivers (Handwerk); Mississippi River, Quincy, 

 Adams Co. (Hart); Winnebago Co.; Wabash and Ohio 

 rivers (Hinkley) ; La Salle Co. (Huett) ; Mercer Co.; Mississip- 

 pi and Wabash rivers (Marsh); Fox River, Algonquin, McHen- 

 ry Co. ; Athens, Menard ('o. ( Nason) ; Fox River, Dundee, Kane 



*Unio inflatux Lea (= Lampmhs alahamenms Conrad) is reported by Wolf from Fulton 

 Co. (Am. Journ. Conch., VI., p. 29). This record is erroneous, as the species is 

 confined to the Alaljania and Tomhighee rivers. 



Unio huUdhix Rafinesque is reported l)y Ulffers from Southern Illinois. I do not know 

 what species this is intended for. Rafinesque descrihed an Ohligiidriii hnlkita, but 

 it is absolutely indeterminate. 



I'liio torsux Rafinesque reported by Ulfiers from Southern Illinois, is indeterminable. 



Unio niger Conrad is reported from Southern Illinois by Ulffers. I know of no spe- 

 cies of that name. r»/o »( I// iVkiV/i's Rafinesque is also an indeterminable species. 

 (Ulffers, p. (ilO.) 



f'liio .iralfithi.i Ratinescpie is reported from Southern Illinois by Ulffers. There is no 

 si'ii/iiiIks of Rafinesque, and sciilmiiis Saj' = I'lrnraheina (Iri'hd Lea, which is 

 contiued to the Alabama and Tombigbee river systems. 



I'liiii ruh'nhindu.t Say is reported by Ulffers from Southern Illinois. There is no rnhi- 

 dundns or rubicandns described by Say. 



