STUDIES ON GERM CELLS 



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Fig. 7 Calligrapha (from Hegner, '09a and '09b). A, longitudinal section 

 through an egg of C. bigsbyana, four hours after deposition. B, longitudinal 

 section through an egg of C. bigsbyana 14 hours after deposition. C, two germ 

 cells just protruding from posterior end of egg of C. multipunctata. D, the pole- 

 disc in an egg of C. multipunctata. g.c.d, pole-disc; g.n, germ nuclei fusing; 

 khbl, keimhautblastem; p, posterior end of egg; pbl.n, preblastodermic nuclei; 

 v.7n, vitelline membrane; rt, vitellophags; y, j'olk. 



