PLATE 3 
Platygaster vernalis 
All figures drawn 2,200 times natural size 
A. —Portion of fertilized egg 24 hours old with male and female pronuclei at 
prophase. 
B. —Fertilized egg one to two days after oviposition, with the cleavage nucleus 
in a differentiated embryonic region. An unfertilized egg of this age has a 
similar appearance, except that the cleavage nucleus is not quite so large. 
C. —Egg (now the parasite body) two to three days old. One of the paranuclear 
masses has divided amitotieally. First division of the cleavage nucleus has pro¬ 
duced two cleavage nuclei in a differentiated embryonic region. 
D. —Section through a three-day old parasite bodj^, showing four cleavage or 
embryonic nuclei and four paranuclear masses. 
E. —Drawing of entire parasite body four days old. The eight embryonic 
nuclei are located in a central or embryonic region, which in turn is surrounded 
by the polar region now known as the trophamnion containing paranuclear masses. 
F. —Section of a parasite body about six days old. Five of the eight embryonic 
nuclei are shown. 
