290 



W. J. CROZIER 



Fig. 23 Showing the relation between the length of C. zebra and the average 

 size of its mates in conjugation, for 19 pairs obtained in an experiment under 

 laboratory conditions. The class unit is 1 cm., the measurements being of 

 total length. Length classes, abscissae; average length of mates, ordinates. 



TABLE 8 



Single-entry correlation table {Jennings), showing the size relations in 19 pairs of 

 C. zebra obtained in one mating experiment {see text) 

 Note: The unusually high correlation observed in this table is an accidental 

 result of the small number of pairs (19) concerned. 



about the same size, somewhat less in December than in May- 

 June; thus, in May, with a sea temperature of 26°, 11 animals 

 between 9 and 12 cms. length laid on the average 7,870 eggs in a 



