HEREDITY AND ORGANIC SYMMETRY IN ARMADILLO. 17 



to indicate that a double scute and an incipient double band are 

 genetically equivalent. 



Fetus II. has in the exact middle of band I a short series of 

 three double scutes like the two which are near the left margin 

 of the mother; and in the same band, midway between the 

 middle and left band margin, one double scute. In band 6 of the 

 same fetus there occurs at a point three scutes to the left of the 

 middle another double scute like that in band i. Note that all 

 asymmetrical anomalies are on the left side as in the mother. 



54 



MOTH e ' 



Bindl 



7?. 



10 



Fetus III. has one double scute in the exact middle of band I, 

 or in a position identical with the short double band in fetus II. 



Fetus IV. has a double region of 7-7 scutes in the exact middle 

 of band I. This doubling is simply a more pronounced case of 

 the doubling shown in the mother as in fetuses II. and III. 



The points of interest illustrated by this set are: 



I. In mother and offspring the unilateral symmetry is the 

 same throughout except that there is a tendency for the anomaly 

 to shift to the center of the band. This shifting of lateral 

 anomalies to the center is a peculiar type of symmetry reversal 

 in which the central and lateral portions of each half band become 



