104 GERM-CELL CYCLE IN ANIMALS 
Von Berenberg-Gossler (1912) considers the ‘‘ Netz- 
apparat”’ in the primitive germ cells of the chick of 
particular importance (Fig. 31, C), comparing it 
with the “ wurstformige Kérper”’ described by Hasper 
gep—O 0000 OO €0@000C@066 Wd } GC db 
Fic. 32.— Diagram to show the history of the germ cells in the embryo 
of the guinea-pig. g.ep = germinal epithelium. (From Rubasch- 
kin, 1912.) 
(1911) in Chironomus (p. 108, Fig. 33). The ap- 
pearance of this structure in ‘‘Keimbahnzellen”’ 
is thought to be due to the long period during which 
these cells do not divide. Duesberg (1912), however, 
after an exhaustive review of the literature on this 
