62 THE NAUTILUS. 



polished white, or with a very small, pale-purplish spot or stain on 

 the columella posteriorly. 



Operculum and animal not preserved. 



Headwaters of the Columbia River, at Upper Columbia Lake, in 

 the East Kootenay District of British Columbia, J. B. Tyrrell, 

 1883 : thirty-seven fresh and living specimens, all of which are in 

 the Museum of the Geological Survey of Canada at Ottawa. 



This species seems to differ from the eastern G. livescens in its 

 much smaller size, fewer whorls, and proportionately shorter spire ; 

 also in the color of its epidermis and aperture. It is believed to be 

 the first non-plicate Goniobasis, of the type of G. livescens, that has 

 been found in the Pacific drainage system. 



Ottawa, August 15, 1905. 



NOTES ON THE SEMI-FOSSIL SHELLS OF POSEY COUNTY, INDIANA. 



BY L. E. DANIELS. 



Ages ago the Wabash River, which forms the western boundary 

 of Posey County, Indiana the extreme southwestern county of the 

 State was much wider than now, as indicated by the range of bluffs 

 which border and run parallel with the bottom-lands of the present 

 river, which, in some places are six miles in width. These bluffs or 

 hills are in most cases one hundred or more feet above the level of 

 the bottom-land, and many of them contain deposits of marl from 

 one to twenty feet in depth. 



During the summers of 19014, while working for the Indiana 

 State Geological Survey, I had an opportunity of examining several 

 of the deposits, particularly at New Harmony and Grand Chain, 

 Posey County, and collected from them several species of recent 

 shells in a fossil state. The marl is usually covered with two or 

 more feet of soil, and the shells occur from six to fifteen feet below 

 the surface, being the more plentiful from the middle to the bottom 

 of the marl deposit. 



Polygyra rnonodon (Rack.) the shell formerly called leai Ward 

 is abundant, but I have been unable to find a single living specimen 

 here, and nowhere else in the State except on the marshes bordering 

 several of the lakes in the northern part of the State, where it is 



