ORGANIC SYMMETRY IN ARMADILLO QUADRUPLETS. 2OQ 



scutes) has a double scute 5 places from the right-hand margin. 

 These two anomalies mark about the inner and outer limits of 

 the band doublings seen in the offspring. This set shows almost 

 perfect mirror-imaging of the whole set of quadruplets. The 

 two primary bud fetuses II. and IV. mirror each other since both 

 have the anomaly bilaterally; the two secondary fetuses I. and 

 III. are also mirror-images, III. having the anomaly on the right 

 and I. on the left. All of these anomalies occur in band I. 



BIBLIOGRAPHY. 

 Bateson, W. 



'13 Problems of Genetics. Yale Univ. Press. 

 Newman, H. H. and Patterson, J. T. 



'09 A Case of Normal Identical Quadruplets in the Nine-banded Armadillo 

 and its Bearings on the Problems of Identical Twins and of Sex Deter- 

 mination. BIOL. BULL., Vol. 17, No. 3. 



'10 The Development of the Nine-banded Armadillo from the Primitive Streak 

 Stage to Birth; with Especial Reference to the Question of Specific Polyem- 

 bryony. Journal Morphology, Vol. 21, No. 3. 

 'n The Limits of Hereditary Control in Armadillo Quadruplets: A Study of 



Blastogenic Variation. Journal Morphology, Vol. 22, No. 4. 

 Newman, H. H. 

 'i3a The Natural History of the Nine-banded Armadillo of Texas. American 



Nat., Vol. 47, Sept., 1913. 



'i3b The Modes of Inheritance of Aggregates of Meristic (Integral) Variates in 

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 Exper. Zool., Vol. 15, No. 2. 

 '15 Heredity and Organic Symmetry in Armadillo Quadruplets. I. Modes of 



Inheritance of Band Anomalies. 

 Patterson, J. T. 



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Vol. 24. 

 Wilder, H. H. 



'04 Duplicate Twins and Double Monsters. Amer. Jour. Anat., Vol. 3. 



