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THE EVOLUTION OF IVIAN, 



Fro. 77. — Egg from the uterus of a Eabbit (4 mm. in diameter). The 

 germmBmbrane vesicle (fc) has slightly retreated from the smooth outer 

 egg-membrane (prochorion, a). The circular germ-area (c) is visible in the 

 centre of the germ-membrane, and at Ihe edge of the former (at d) the inner 



