D 
Fic. 36.— Calligrapha. 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. multi- 
punctata. D. The pole-dise in an egg of C. multipunctata. g.c.d. = 
pole-disc ; g.n. = germ nuclei fusing; kAbl = keimhautblastem ; p. = 
posterior end of egg; p.bl.n. = preblastodermic nuclei; v.m. = vitel- 
line membrane; vt. = vitcllophags; y. = yolk. (114) 
