Inheritance in Diffiugia 



53 



FIG. 206. 



Figure 20. Difflugia corona. Parent and immediate offspring in 18 

 diverse families, all drawn to the same scale, to show the variation and 

 the inheritance of the parental characteristics by the progeny. In each 

 pair the parent is above, its offspring below, the two connected by a 

 line. If each family is bred for many generations, it continues to 

 remain true to the type shown. (The numbers are the designations of 

 the families to which the individuals belonged.) After Jennings, 1916. 



