THE NAUTILUS. 131 



I have in my collection specimens from sixteen counties in Mis- 

 souri, and these vary greatly in size I'rom 18 mm. to 32 mm. diam- 

 eter. The largest is from Scott county in southwest Missouri ; Irom 

 Galena, Stone county they vary from '26 to 30 mm.; from Boone 

 county from 23 to 30 mm.; and Irom Kansas City 18 to '27 mm. 



The specimens from Kansas City are interesting, and the average 

 size at two points within the City ditfeis quite markedly. From an 

 old cemetery near Main and 27th streets 1 collected more than 

 ninety living shells, and from the blutt's about the Union Station I 

 found eight dead shells ; ths following table will show the sizes from 

 the two places : 



Diameter, Mm. Cemetery. Blurts. 



18 2 

 18.5 2 



19 11 

 19.5 7 



20 20 1 

 20.5 8 



21 16 

 21.5 6 



22 7 

 22.5 5 



23 5 1 

 23.5 1 2 



24 1 1 

 24.5 1 



25 1 1 

 27 1 



At Boonville I found one dead but fresh shell of Polygyra miiltili- 

 nc'if'i Say, the only one 1 have found in the State. The Ply<iyra 

 diveata Gld., is found living in the southern counties of the Slate, 

 and I have it from the Postpliocene at St. Joseph. From the Post- 

 pliocene of Boone and Moniteau counties I have the Polygyra j>ro- 

 fituHa S;y, but have not found it living in the Slate. To the 

 NAI TILIJS lor June 1894, I noticed finding Pulygyra andrewsce W. 

 G. B. in St. Francois county. I have P. pemtsylranica from St. 

 Louis county, and from the Postpliocene of Boone county. 



