A PRELIMINARY LIST OF THE MOLLUSCA OF 



MISSOURI (EXCLUSIVE OF THE 



UNIONID^.)* 



F. A. Sampson. tt^y^^n^-. 



To tMs time no list of the shells of Missouri has been 

 published. In many of the other States much more 

 work has been done than in this. Baker's Catalog of 

 the Mollusca of Illinois showed that ten counties in that 

 State had been carefully listed, and records had from 

 fifty-nine other counties. Lists of species had been pub- 

 lished as early as 1854. 



Five writers had published papers on the shells of 

 Michigan, when in 1905 Bryant Walker gave a list of 

 272 species in that State. Of quite a number of other 

 States lists have been published. In Missouri the 

 author published a report on the shells of Pettis county, 

 in the Kansas City Review of Science and Industry, and 

 later in the Bulletin of the Sedalia Natural History So- 

 ciety, and published notes on some of the other coun- 

 ties of the State. Pilsbry and Ferriss collected in some 

 of the southern counties of the State, but as a whole 

 little has been done. The author interested Mr. 0. A. 

 Crandall, of Sedalia, a few years before his death, and 

 he had collected in a number of the counties; his collec- 

 tion is now a part of the Bryant Walker collection in 

 Detroit. The collecting of the author has been done in 

 a hurry at odd hours while doing other work; and while 

 extending into sixty-four counties, has approached 

 thoroughness in but one. It is to be hoped that this 

 paper will be the means of inducing a number of other 

 persons to collect in their home localities, and communi- 

 cate the results to the writer, that a more complete list 



*Presented by title to The Academy of Science of St. Louis, June 2, 

 1913. 



(67) 



