ORGANIC SYMMETRY IN ARMADILLO QUADRUPLETS. l8l 



fication has proceeded antero-posteriorly and in this single di- 

 rection. In the armadillo banding has proceeded both ways 

 from the middle. Various armadillo species today exhibit all 

 the way from one to twelve bands, a fact that supports the idea 

 that in our species there has been a gradual increase in the 

 number of bands. 



B. PRESENTATION OF DATA CONCERNING THE INHERITANCE 

 AND DISTRIBUTION AMONG QUADRUPLETS OF DOUBLE 



SCUTES. 



The following tabulation gives all of the facts concerning double 

 scutes, except those brought out in connection with the earlier 

 paper on double bands (Newman, '15). I know of no method for 

 presentation of data of this kind that is at once so intelligible 

 and so compact as the pictorial diagram used in this and the 

 former paper. When one has read the key to the table there 

 should be no difficulty in understanding the data thus presented. 

 The facts are first presented for those sets in which both mothers 

 and offspring have double scutes, covering pages 182 to 188, and 

 there follows as an appendix to this paper a table for those sets 

 in which the mother was without double scutes, but in which one 

 or more of the offspring have inherited the double scutes from 

 the unknown father. See pp. 204 to 207. 



KEY TO TABULATION OF DOUBLE SCUTES. 



Each solid block of bands shows the anomalies in position as 

 though the bands were straightened and placed with the right- 

 hand end to the right and left-hand to the left. The number of 

 the set with the sex of the quadruplets is indicated above and at 

 the left of each block. Bands of the mother that show anomalies 

 are marked M; those of the offspring that show anomalies are 

 marked according to previous custom I., II., III., IV. I. and II. 

 are a natural pair, II. being a primary bud individual and I. its 

 twin secondary bud derivative. Similarly III. and IV. are a 

 natural pair, IV. primary and III. secondary. If the anomaly 

 occurs in different bands of the same individual a bracket includes 

 the Roman numerals indicating the individual fetus concerned. 

 The various types of double scute are drawn in upon the band in as 



