HEREDITY AND ORGANIC SYMMETRY IN ARMADILLO. 2"J 



and are the secondary bud derivatives of II. and IV. respectively, 

 are exact symmetrical reversals of each other, I. having the 

 anomaly only on the left and III. only on the right. 



Fetuses II. and IV., the two primary bud individuals, both 

 show the anomaly bilaterally, but are also reversals, in that II. 

 has the more extensive doubling 9-9 on the right and IV. has the 



more extensive doubling 9-8 on the left. It is interesting to 



note that the primary individuals II. and IV. are bilateral in 



their expression of the anomaly, and that the secondary indi- 

 viduals I. and III. are unilateral. 



Set A. 64, cf (Fig. 14). 



This set is remarkable for the striking identity of detail 

 exhibited by the anomalies of the different fetuses. 



Fetus I. has both halves of band I completely double. 



Fetus II. has both halves partially double and exactly bi- 

 laterally symmetrical, the doubling starting 3 scutes from the 

 margin on each side and extending for 15-15 scutes. 



Fetuses III. and IV are both exactly like II. on the left side 

 and exactly like I. on the right. 



There is exactly the same amount of doubling in I. plus II. 



