PLATE 4 
Platygaster vernalis 
A.—Section of parasite body about seven days old, showing thirteen of its 
sixteen embryonic nuclei forming germs. The parasite body has increased in 
size considerably. X2200. 
" B.—Section through a poly germ about ten days old, showing five germs and 
one morula. The darker nuclei in the periphery are paranuclear masses. 
xnoo. 
C. —Section through a poly germ about twelve days old, showing portions of 
five germs. The two upper germs have just been produced by the division of a 
parent germ. Each germ is lodged in an embryonic cavity which is surrounded 
by a somewhat vacuolated trophamnion containing paranuclear masses. Since 
development takes place in the mid-intestine of the host, no cyst of host tissue 
ever surrounds the parasite body. X1100. 
D. —Aborted or pseudoparasite body, found sometimes in host with a healthy 
parasite body, in the process of degenerating. Twelve days after oviposition. 
X1100. 
E. —Section of a polygerm about thirteen days after oviposition, showing por¬ 
tions of six embryos in the germ or early blastula stage, and two paranuclear 
masses in the trophamnion. X1100. 
F. —In toto drawing of a polyblastula with nine blastulas in the embryonic 
region which is surrounded by the trophamnion, containing its dark staining 
paranuclear masses. X 550. 
