Article VI.— A Catalogue of the Moll, ism of Illinois. By 

 Frank Collins Baker. 



Introductory. 



The following catalogue of Illinois mollusks is intended to 

 record every reference to the Mollusca occurring in the state 

 which may be found in the few published lists, and also all scat- 

 tered references to the same, wherever published. The bibliog: 

 raphy is believed to contain a majority of the publications re- 

 ferring to the Mollusca of the state, but it can scarcely be com- 

 plete, since references probably exist which are unknown to 

 the author. 



The classification is that of Dall, Pilsbry, and Simpson. 

 The valid species (so considered at the present time) overhang 

 at the margin, while those specific names which have been used 

 in Illinois references and which are now considered synonyms 

 follow in parenthesis. In indicating the geographical distribu- 

 tion the author has deemed it best simply to quote every local- 

 ity from which specimens have been recorded, adding after each 

 locality, in parenthesis, the name of the collector or author who 

 is authority for the same. By this means an exact census of 

 our molluscan fauna will be secured, based on actual collections. 

 There have been several references to species which are evi- 

 dently founded on misidentifications. These are indicated in 

 foot-notes under their respective genera. Several specif- arc 

 listed on the authority of correspondents, and the identifica- 

 tions have not been verified. 



Acknowledgments are clue to the following Illinois con- 

 chologists, w r ho kindly furnished more or less exhaustive lists: 

 Mr. A. A. Hinkley, DuBois; Mr. J. H. Ferriss and Mr. J. II. 

 Handwerk, of Joliet; Mr. W. A. Marsh, Aledo; Dr. \Y. A. Nason, 

 Algonquin; Dr. W. S. Strode, Lewiston; and Mr. Charles A. 

 Hart, of Urbana. The following persons have also aided in tin- 

 work, either by presenting collections to the Chicago Academj 



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