PLATE 2 
Platygaster vernalis 
All figures drawn 2,200 times natural size 
A. —Unfertilized egg, immediately after oviposition, containing the nucleus. 
B. —Fertilized egg 30 minutes after oviposition, with nucleus and vermiform 
sperm. 
C. —Unfertilized egg five hours old, with the nucleus beginning the first 
maturation. 
D. —Fertilized egg six hours old, showing the male nucleus and the first matu¬ 
ration spindle. 
E. —Like D, but at slightly later stage. The anterior nucleus becomes the 
first polar body, the middle nucleus the oocyte nucleus of the second order. 
F. —Like D and E, but slightly further advanced. 
G. —Fertilized egg 10 hours after oviposition. The first polar body and the 
oocyte nucleus of the second order show their nuclear material much condensed, 
while the male nucleus has meanwhile expanded and become spherical. 
H. —The beginning of second maturation of a fertilized egg, about 12 hours 
after oviposition. 
I. —Like H, but a slightly later stage. 
J. —Egg 12 hours old. Second maturation is completed, and a second polar 
body and the female pronucleus are formed. 
K. —Between the twelfth and twenty-fourth hours the egg increases slightly in 
size. The two polar bodies have migrated to the anterior end of the egg, and 
begin to increase in size. 
L. —Polar bodies become elaborated and are henceforth known as paranuclear 
masses. Male and female pronuclei about to unite. Egg 24 hours old. 
