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LYMNAZIDAH OF NORTH AMERICA. 1 
Tyre Locauity: 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 columella. 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 
ad 
eS 

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. 
