ORGANIC SYMMETRY IN ARMADILLO QUADRUPLETS. 179 



87 females and 100 males have scute anomalies. There appears 

 therefore to be a somewhat pronounced tendency toward band 

 anomalies as against scute anomalies in females and the reverse 

 in males. In a collection of this size, however, these differences 

 may not be significant. 



5. Distribution of Scute Anomalies as to Bands. 



In the earlier paper of this series it was shown that the band 

 anomalies are largely confined to the first two bands: 86 per cent, 

 in band I, 8 per cent, in band 2, and the rest scattered; none oc- 

 curring in bands 5 or 6, which are in the middle of the banded 

 region, or in band 9. The reason given for this state of affairs 

 is that band doubling is normal for the scapular and pelvic regions 

 and that the bands nearest the scapular and pelvic shields are 

 naturally more like these regions than are those farther removed 

 from them. 



A somewhat similar condition, though less pronounced, is 

 brought out by a census of double scutes according to bands: 



Band I has double scutes 67 times. 

 Band 2 " 40 " 



Band 3 " 40 



Band 4 " 34 " 



Band 5 " 9 " 



Band 6 " 27 



Band 7 " 34 



Band 8 " 29 " 



Band 9 " 9 " 



It is significant that double scutes, like double bands, occur 

 most frequently in the first three bands and least frequently in 

 bands 5 and 6 and 9, where band anomalies were entirely absent. 

 Bands 5 and 6 are farthest from the scapular and pelvic regions 

 where doubling is the normal condition. Band 9 is really not a 

 free band at all, but only partially free at the margins; hence it 

 may be left out of consideration. It is really out of the series of 

 bands and should be included in the pelvic shield, but, out of 

 deference to the time honored name "nine-banded armadillo," 

 I have treated it as the ninth band. 



