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 Korper " described by Hasper 



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FiG. 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 (191*2), however, 

 after an exhaustive review of the literature on this 



