PLATE 4 
Platygaster hiemalis 
A. —One germ of a twin that has become disjoined from the other. It is surrounded 
by host tissue and its embryonic region contains four nuclei. One paranuclear mass 
is shown in the trophamnion. Xi,ioo. 
B. —Embryo in the early blastula stage containing 16 embryonic nuclei, of which 7 
are shown. X 1,100. 
C. —Monembryonically developing egg in 32-cell blastula stage with two paranuclear 
masses in the trophamnion. Host tissue omitted. X 1,100. 
D. —Blastula stage of embryo. Note the breaking up of the paranucleus into smaller 
masses. X550. 
E. —Embryo at the time of formation of germ layers. X550. 
F. —En toto drawing of U-shaped embryo within its trophamnion. One large par¬ 
anuclear mass is located above it. X108. 
G. —Outline drawing of a parasite larva with paranucleus. The trophamnion has 
become reduced to a thin membrane. X60. 
54486—23-2 
