132 FERNANDUS PAYNE. 



of each pair are of approximately equal volume except the two 

 marked K, k. There is probably no monosome because the 

 number is an even one." 



&'. 





FIG. 5. Prioniihis cristatus Linn. A and B, female cells showing 28 

 chromosomes the six smallest ones are the differential chromosomes ; C , D, 

 E and F, male cells, 26 chromosomes only three of the four differential 

 chromosomes can be recognized with certainty they are the three smallest 

 ones; G and H, polar views of the first maturation division, 15 chromosomes 

 the four smallest ones are the differential chromosomes ; 7 and J, polar views 

 of the second division, metaphase only three differential chromosomes are 

 shown ; K and L. side views of the second division, metaphase, showing the 

 arrangement of the tetrad group. The enlargement is 3,726 diameters. 



