SIZE RELATIONSHIPS IN BLEPHARISMA UNDULANS. 



197 



conjugants of lot I is 21 units and that the number of individuals 

 increases rather rapidly from the extremes, 17 and 30, toward the 

 mean, 21 ; also that the mean length of the non-conjugants is 29 

 and that the number of individuals increases slowly at first and 

 then more rapidly from the extremes 18 and 40 to the mean 29. 

 The average lengths of the conjugants and non-conjugants is in 

 accord with the mean length, being greater in the case of the 

 non-conjugants and less in the case of the conjugants (Table I.). 

 Plate II. shows that the mean length of the conjugants of lot 

 2 is less than the mean length of the non-conjugants, the former 

 being 22 and the latter 32. The number of individuals of the 

 conjugants and non-conjugants increases from the extremes 18.5 

 and 28 in the case of the former, and 18.5 and 42.5 in the case of 

 the latter, to the means 22 and 32. That the increase from 

 extremes to means is much more gradual in lot 2 than in lot I , is 

 due to the fact that there are over twice as many individuals 

 in lot i as in lot 2. The average length of the conjugants is less 

 than that of the non-conjugants, as in lot I, being 23.46 and 

 33.88 respectively. 



TABLE I. 



SIZE RELATIONS IN CONJUGANTS AND NON-CONJUGANTS. 



N. indicates non-conjugants. 

 C. indicates conjugants. 



Lot 3, Plate III., shows the same relative conditions as to mean 

 and average length of conjugants and non-conjugants, the mean 



