OF NORTH AMERICA. 



173 



TYPE LOCALITY : Chalybea, Cambridge, Mass ; strigosa, near Cin- 

 cinnati, Ohio; coarctata, Newport, R. I. 



ANIMAL, JAW, RADULA AND GENITALIA : Not examined. 



RANGE (Figure 13) : Chalybea covers about the same range as 

 typical columclla. Its range is principally confined to the eastern part 

 of the United States, and embraces the Carolinian and Nova Scotian 

 regions, the southern part of the Canadian region and the eastern half 

 of the Mississippian regions ; in Texas it lies on the border of the Rio 

 Grandian region. Its absence from Louisiana, Mississippi, etc., can 



Distribution of 

 CHALYBEA 

 Loess 



yoo 



FIG. 13. 



be accounted for only by lack of records. It seems to be an inhabitant 

 of deciduous forest areas. A fossil specimen has been seen from Union 

 County, South Dakota, and future search may discover the variety in 

 this part of the prairie region. Its northern range may also be some- 

 what extended when it is differentiated from typical columella. 



