PLATE 7 
Platygaster vernalis 
A. —Photomicrograph of polyembryonal mass distributed throughout the mid¬ 
intestine of the host. Sections of five embryos are shown which have just 
differentiated the germ layers. Note that the trophamnion is vacuolated* 
X93. 
B. —Photomicrograph of polyembryonal mass lodged in the anterior end of 
the host's mid-intestine. The embryos have almost or quite reached the stage 
of the primary larva. The black area surrounding the embryonal mass rep¬ 
resents the chyle of the host. The lower primary larva is just beginning to 
devour the remnants of the trophamnion. X62. 
