e 



Fig. 9 a— Development of the newt's egg. {a) The blastula in its membranes, (b) View 



from underneath of the early gastrula showing the beginning of the blastopore. 



(c) Later view of the round blastopore, {d) View from aljove of the slit-like blastopore 



at the end of gastrulation. (e) Later view showing the open neural plate 



