150 4 a ILLINOIS ACADEMY OF SCIENCE 
Estimated modal num- 
bers of branched anal Regions 
rays 
sty | Red River of the North 
11 North Dakota 
11 Wisconsin (Lake Pepin) 
11 Michigan 
11 Northern Illinois 
11 North central Ohio 
111% Iowa and northern Missouri 
11% About southern endof Lake Michigan 
12 Indiana 
12 - Western Ohio 
13 Southern Missouri 
13 Texas 
13 Arkansas 
13 Maryland and Potomac River 
13% Southern Virginia 
14 Alabama 
141% South Carolina 
15 Florida 
It thus appears that, as regards the number of anal rays, the 
most important distinctive feature, crysoleucas blends into 
boscii, the number of rays becoming gradually more numerous 
from the northwest to the southeast. How gradual this inter- 
gradation really is, can be emphasized by considering the con- 
ditions in [llinois‘and the adjacent states. In Indiana I find 
the number of anal rays to vary from 9 to 14, twelve occurring 
most frequently. In Michigan, in northern Illinois, and in the 
states to the west of Illinois, I find the variation to be from 8 
to 15 instead of 9 to 14; the number 11, rather than 12 occur- 
ring most frequently. It seems rather surprising that the 
golden shiners of Indiana should present this slight racial 
difference when compared with others from the Illinois River 
basin, but the difference is in agreement with the more south- 
ern facies of the fauna just southeast of Lake Michigan. About 
the southern tip of Lake Michigan the modal number is 
between 11 and 12. 
