274 MARGARET MORRIS HOSKINS. 



EXPLANATION OF PLATE I. 



All the figures on this plate are from fertilized eggs, heated immediately after 

 insemination. 



FIG. i. First polar, spindle, anaphase, male pronucleus at the left. 

 FIG. 2. First polar, spindle, telophase. Male pronucleus at the right. 

 FIG. 3. Daughter nuclei from maturation division, male pronucleus below. 

 FIG. 4. Diploid female pronucleus and normal male pronucleus uniting. 

 FIG. 5. Prophase, first cleavage. 



