54 



ROBERT W. HEGNER 



While these numbers are too small for definite conclusions, it 

 appears very probable that lines permanently diverse in diameter 

 but with the same number of nuclei might easily be isolated within 

 this family. 



Slaaetar of ehall 



Fig. 37 Areella polypora. Curves for the variations in diameter in the group 

 of specimens of family ap. 5 with 4 nuclei and of family ap. 34 with 7 nuclei; plot- 

 ted from tables 15 and 21. The ordinates are numbers of specimens; the abscis- 

 sae are diameters, and the numbers at the top of the curves indicate the number 

 of nuclei in the corresponding group of specimens. 



g. Relation between diameter of shell and diameter of mouth in wild 

 populations and within families 



Among the specimens of Areella collected at Cold Spring Har- 

 bor were a number of multinucleates that were much greater in 

 diameter than any previously discovered and in which the mouth 

 opening obviously was larger in comparison with the diameter 

 of the shell than was true of the other multinucleate specimens 

 examined. These specimens ranged in diameter from 176 m to 

 232 n, whereas the other multinucleates under observation ranged 



