THE MEIOTIC PHENOMENA IN BLAPS 103 
segregates from the others and passes into one of the secondary 
spermatocytes, which receives sixteen chromosomes (15 euchro- 
mosomes plus 1 chromosome of the X-complex). The other 
spermatocyte receives nineteen chromosomes (15 euchromosomes 
plus 4 chromosomes of the X-complex). 
8. There is no conclusive evidence of predetermination in the 
segregation of the M-chromosomes during the reduction division. 
It is possible that their distribution with reference to the X- 
chromosome follows the law of chance. 
9. The chromosomes of the X-complex are separate in the 
secondary spermatocytes and the two classes of the latter are 
found in about equal numbers. 
~ 10. The second maturation mitosis is equational. 
11. The X-complex seems to represent an intermediate con- 
dition between complexes made up exclusively of sex chromo- 
somes and those originated by the linkage of a sex chromosome 
with a pair of ordinary chromosomes. 
