ASSORTIVE MATING IN CHROMODORIS ZEBRA 



257 



60 



40- 



p- 

 . I — 



r d I _^ 



SO — 



4 5»6 7 5 3 10 II IS 13 14 \5 \6 ir 18 cm3. 



Fig. 7 The lighter line shows the frequency distribution of total-lengths for 

 the constituents of pairs of Chroniodoris zebra obtained in the field (148 pairs, 

 296 individuals); the heavier line shows the same for pairs formed in laboratory 

 experiments (119 pairs, 238 individuals). 



TABLE 1 



Correlation table for the lengths of 148 pairs of Chromodoris zebra found under nat- 

 ural conditions. The larger member of a pair is entered in the vertical columns, 

 the smaller in the horizontal rows. The unit of measurement is 1 cm. The in- 

 dex of correlation is r = 0.608 ± 0.02^1. 



