Inheritance in Difftugia 



55 



Figure 21. Difflugia corona; portions of four families, to show the 

 inheritance of the diverse combinations of characters. All individuals 

 of any column are descendants of the one at the top. The num- 

 bers at the top are the designations of the different families. Ob- 

 serve that in family 198 all are small, but with numerous spines; in 

 197, they are larger, but with few spines. In 324- the individuals are 

 large, with large spines; in 323 they are of about the same size, but 

 with small spines. The families remain true to such peculiarities, no 

 matter how long they are bred. After Jennings, 1916. 



