56 



In 1898 Mr. John W. Huett published a volume on "The 

 Natural History of La Salle County, Illinois," in which (Part 

 II., p. 96) 92 species of land and fresh-water shells are listed. 



In 1898-1902 Mr. Frank C. Baker published a report on 

 "The Mollusca of the Chicago Area", in which 164 species are 

 recorded for Cook, Du Page, and Will counties. 



In addition to these more or less extensive lists, numerous 

 papers have been published in which Illinois shells are men- 

 tioned, and also quite a number which are devoted to critical 

 remarks or notes on the geographic distribution or economic 

 value of Illinois mollusks. The works of Binney, Bland, Con- 

 rad, Haldeman, Kuster, Lea, Pilsbry, Prime, Say, Simpson, Ster- 

 ki, Tryon, and Walker contain many references to Illinois spe- 

 cies, as well as descriptions of some species new to science. 



There have been twenty-eight species and varieties new to 

 science described from Illinois specimens. These are as fol- 

 lows: 



Unto upsoni Marsh. Mercer County. 

 Sph.serium lilycashense Baker. Lilycash Creek. 



" stamineum forbesi Baker. Matanzas Lake. 

 Mu8culium hodgsoni Sterki. Albion. 

 Corneoc>/clas handwerki Sterki. Lilycash Creek. 



roperi Sterki. Higginbotham's Spring, Joliet. 

 Campeloma subsolidum Anthony. Illinois. 

 Amnicola pUsbryi Walker. Rockford. 

 Pyrgulopsis mississippiensis Pilsbry.- Mississippi River, near Rock River. 



scalariformis Wolf. Tazewell Co. shore, Illinois River. 

 Pleurocera leirisii Lea. Peoria. 



moniliferurn Lea. Ohio River, near its mouth, in Illinois. 

 Goniobasis grosvenorii Lea. Fox River. 

 Physa hildrethiana Lea. A lake in Illinois. 

 elongata Say. Shores of Illinois. 

 Lymnsea tazewelliana Wolf. Tazewell Co. shore, Illinois River. 

 woodruffi Baker. Lake Michigan. 

 " ferrissii Baker. Joliet. 

 " sufflatm Calkins. Calumet River, Chicago. 

 " reflexa jolietensis Baker. Joliet. 



reflexa crystattensis Baker. Crystal Lake. 

 Vallonia parvula Sterki. Joliet. 

 Zonites upsoni Calkins. Rockford. 

 Vertigo tridentata Wolf. Canton. 



