NUCLEOPLASMIC RELATIONS TN ARCELLA 5 



removal of part of the parental cytoplasm. The first offspring 

 of this specimen, however, was as large as the original parent and 

 the mass relations between nuclei and cytoplasm were thus 

 regained. It may be noted that the protoplasm removed con- 



Fig. 1 Arcella dentata. Outline of the shell of the progenitor of family 150. 

 The inner circle represents the mouth opening. X 207. 



Fig. 3 Arcella dentata. Outline of the shell of specimen 150.1. The cross 

 line indicates the portion of the shell and cytoplasm removed. The small circles 

 represent the two nuclei. X 207. 



Fig. 5 Arcella dentata. Specimen 150.2. The cross line indicates where it 

 was cut in two. The upper, smaller portion was the progenitor of line 150.2a; 

 the lower, larger portion, of line 150.2b. X 207. 



Fig. 6 Arcella dentata. Specimen 150.2bl. The first offspring of the larger 

 portion of specimen 150.2 shown in figure 5. X 207. 



tained a portion of the chromidial net which is so conspicuous in 

 Arcella (fig. 4), but there is no evidence that its removal affected 

 the characteristics of the organism. 



8. The reproduction of uninucleate pieces. The next problem 

 was to determine the effects on the organism of removing one 



