24 H. H. NEWMAN. 



Fetus II. has a double scute in position 2 from the left-hand 

 margin of band 3. This is evidently a reversal of the conditions 

 seen in the mother and is also a complex reversal, with shifted 

 position on the primary axis, of the condition seen in its twin 

 partner, fetus I. 



Fetus IV. has a double scute in band 6, situated with refer- 

 ence to the middle of the left half band in about the same relation 

 as is the peculiarity of the mother with reference to the middle of 

 the whole band. In other words it is 5 scutes to the left of the 

 middle of the left half of band 6, while that of the mother is 

 situated 5 scutes to the left of the middle of band 5. Considering 

 the rarity of anomalies of any sort in the bands 3, 4, 5 and 6, 

 there can be no doubt of the genetic identity of these elements. 

 Granting this the interpretation offered is not forced. 



Set K. 75, 9 (Table B 2}. 



Here the mother has two double scutes, one near the middle of 

 the right half of band I and another to the right of the middle of 

 band 2. 



Fetus I. has a double scute in band 2 identical in position with 

 one of those of the mother. 



Fetus IV. has in band 8, in a position with reference to the 

 middle identical with one of those of the mother and that of 

 fetus I., an incipient band doubling of 2 scutes. This is another 

 example of the shifting of an anterior element to a position 

 further down the primary axis. It also emphasizes the genetic 

 identity of band and scute doublings. 



Set .46, rf 1 (Table B 2}. 



The mother shows a reduplicated double scute anomaly in 

 bands 2 and 6 in positions 2 and 3 respectively from the right- 

 hand margin. 



Fetus I. shows in band 2 an exactly reversed mirror-image 

 reversal of the anomaly in band 2 of the mother and in addition 

 an extensive doubling in the middle of band I. This illustrates 

 three points; (a) reduplication down the primary axis, (b) the 

 genetic relation between scute and band doubling, (c) the half- 

 band type of reversal of symmetry. 



