No. 558] CLONAL VARIATION IN PEC TLX A TELL. I 



hooks named at the top of the column; the frequencies 

 are reduced to 1,000 statoblasts per colony. The column 

 at the extreme right gives the average number of hooks 

 for each colony together with the standard deviation of 

 the distribution. 



TABLE VII 



13 

 5 24 



s 



12 61 203 203 



From Tables III to VIII it appears that certain Pecti- 

 natella masses are characterized by a great constancy in 

 the modal and the average number of hooks in a colony. 

 Thus, in Table III the range in the average is only from 

 15.36 to 15.75, or 0.4, and the modal number of hooks is 



